Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
5,696 results · page 4 of 114
Oct 9, 2026AcyMailing SMTP Newsletter: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CVE-2026-105318 · WordPress plugins & themes · reported by PatchstackHigh 7.1
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Datasolution AcyMailing SMTP Newsletter acymailing allows Reflected XSS.This issue affects AcyMailing SMTP Newsletter: from n/a through 11.1.0.
- Product
- AcyMailing SMTP Newsletter
- Affected
- up to 11.1.0
- What to do
- Affects up to 11.1.0. Update AcyMailing SMTP Newsletter to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Oct 8, 2026FreeScout is a self-hosted help desk and shared mailbox.CVE-2026-107393 · Other software · freescout-help-desk · reported by GitHubMedium 6.1
FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.235, when APP_CLOUDFLARE_IS_USED is enabled, FreeScout trusts an unvalidated CF-Connecting-IP header during failed login attempts and stores the spoofed value in the activity log. LogsMonitor inserts the value into an administrator alert email without HTML escaping, allowing injected HTML to execute when an administrator opens the email. This issue is fixed in version 1.8.235.
- Product
- freescout
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send cCVE-2026-50055 · Email & office · Zimbra · reported by cve@rapid7.comMedium 6.5
A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.
- Product
- Zimbra Collaboration Suite
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Uncontrolled eviction in the browser session table of the REST API in Progressive Robot hMailServer 6.2.28 through 6.3.5 allows a remote authenticated user to eCVE-2026-107586 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 4.3
Uncontrolled eviction in the browser session table of the REST API in Progressive Robot hMailServer 6.2.28 through 6.3.5 allows a remote authenticated user to end other users' sessions. The table of browser sessions, shared by every account, the server administrator and support sessions, dropped its least recently used session whenever it was full, whoever it belonged to, and placed no limit on how many sessions one account could hold. A user who repeatedly signs in with their own mailbox password can therefore keep the table full and sign out every webmail and administration session that is idle for more than a short time, for as long as they continue.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker toCVE-2026-107585 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 5.3
Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to make other users' OpenID Connect, SAML and passkey sign-ins fail. The routes that start a single sign-on and hand out a passkey sign-in challenge are reached without authentication and stored pending state in bounded tables that dropped their oldest entry when full, whoever had started it. An attacker who starts sign-ins a few times a second (about a hundred a second for passkeys) pushes every other user's pending sign-in out of the table before that user's browser returns, denying single sign-on and passkey sign-in for as long as the requests continue.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026EspoCRM before 10.0.5 contains an insecure direct object reference vulnerability in PersonalAccount\Service that allows users with Email Account scope access toCVE-2026-105833 · Other software · espocrm · reported by VulnCheckHigh 8.3
EspoCRM before 10.0.5 contains an insecure direct object reference vulnerability in PersonalAccount\Service that allows users with Email Account scope access to retrieve other users' IMAP passwords. Attackers who know a victim's Email Account record ID can request that record to steal stored IMAP credentials and access the victim's mailbox.
- Product
- espocrm
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 8, 2026Improper certificate validation in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to have S/MIME-encrCVE-2026-107587 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 5.9
Improper certificate validation in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to have S/MIME-encrypted mail that the account later sends to another correspondent also encrypted to the attacker's key. When its recipient opened a signed message, the webmail kept the signer's certificate for encrypting replies whether or not the server found its chain trusted, under the first e-mail address the certificate listed rather than the message's From address, and beside any certificate already held for that address. Encrypted mail later sent from the webmail to that address was encrypted to every certificate held for it, so a holder of the kept certificate's key who obtains a copy of such a message can read it.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Progressive Robot hMailServer 6.0.0 through 6.3.5 fails open when applying DANE (RFC 7672) to outbound SMTP delivery.CVE-2026-107584 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.4
Progressive Robot hMailServer 6.0.0 through 6.3.5 fails open when applying DANE (RFC 7672) to outbound SMTP delivery. The server's validating DNSSEC resolver treated a TLSA or MX lookup that did not complete (no answer, SERVFAIL, a malformed reply), an answer without the requested records and without an NSEC/NSEC3 proof of their absence, and an answer whose records carried no applicable RRSIG as if the recipient domain were unsigned, and from 6.2.19 it also delivered to mail exchangers taken from an unvalidated MX lookup that the DNSSEC-validated MX record set did not name. An attacker who can drop, forge or strip DNS answers on the path to the server's resolver, at the resolver, or between the resolver and the recipient domain's name servers, and who holds an active position on the SMTP path, can thereby disable DANE for a DNSSEC-signed recipient domain and cause messages to be delivered in cleartext or to a host of the attacker's choosing with an arbitrary certificate, where they can be read and modified.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthentiCVE-2026-107583 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.5
Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. The route that renders a received message's HTML replaced each reference to an embedded image in place, with work that grew with the square of the number of references, and wrote the image out for every reference while counting it against its size limit only once. A message whose HTML refers to one small embedded image a very large number of times, opened in the webmail by its recipient, therefore keeps one of the listener's four worker threads busy for minutes and makes it build a document of gigabytes, so that a few such messages leave the HTTP listener unable to answer anybody.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the REST API (6.3.3 through 6.3.5) and the IMAP PREVIEW response (6.2.22 through 6.3.5) of Progressive Robot hMailServer aCVE-2026-107582 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.5
Inefficient algorithmic complexity in the REST API (6.3.3 through 6.3.5) and the IMAP PREVIEW response (6.2.22 through 6.3.5) of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. To show a snippet of each message in a folder's message list, the server decoded the character entity references of a message that has an HTML part and no text part with a string replacement whose work grew with the square of their number. A received HTML-only message holding a very large number of entity references therefore keeps one of the listener's four worker threads busy for minutes or longer each time the recipient's webmail lists the folder, without the message being opened, so that a few such listings leave the HTTP listener unable to answer anybody. The IMAP PREVIEW response read such text the same way, holding an IMAP thread for each client that asks for the preview of such a message. The flaw is in the server's shared string class, whose replace and remove both ran in quadratic time.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Progressive Robot hMailServer 6.0.0 through 6.3.5 processes several IMAP commands from a signed-in account in time quadratic in the command's length or in the nCVE-2026-107581 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.5
Progressive Robot hMailServer 6.0.0 through 6.3.5 processes several IMAP commands from a signed-in account in time quadratic in the command's length or in the number of elements it names, and can be made to hold memory out of proportion to a command. The FETCH data-item parser normalised a BODY[] section with a case-insensitive string replacement that copied the whole item per occurrence and split the item list by repeatedly copying the remainder of the command; the server's case-insensitive search compared a needle afresh at every position, so a long SEARCH TEXT key over a message cost the product of the two lengths; SEARCH message sets and the saved-result marker ($), SORT criteria, HEADER.FIELDS name lists and UID ranges were each read once per message rather than once per command; and a FETCH naming a message's sections very many times read and held every section in memory before sending any. An IMAP command may continue past one line through non-synchronizing literals, so one command can reach about eleven megabytes. The IMAP worker threads are a small pool shared with SMTP and POP3, so a signed-in user sending such commands can make the IMAP, SMTP and POP3 services stop respo
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the decoding of message header fields in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticatedCVE-2026-107580 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.5
Inefficient algorithmic complexity in the decoding of message header fields in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticated attacker to make the IMAP, SMTP and POP3 services, or the webmail, unavailable by sending a message. The server unfolded a decoded header value by finding each line break from the end of the value and removing it, moving the rest of the value each time, so its work grew with the square of the number of line breaks, and an RFC 2047 encoded word may decode to any number of them. A received message whose Subject or other header field holds such a value keeps a worker thread busy for minutes or longer each time the value is read: when the recipient's IMAP client searches, sorts or threads the folder by a header, when the webmail lists the folder, and, where configured, when a rule tests a header, a spam tag is added to the Subject or an abuse report is read during delivery. The IMAP worker threads are shared with SMTP and POP3, so a few such messages stop those services responding. The server's reading of a message header from its file also searched everything read so far after each 4,000 bytes, costing seconds for a header of
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the bounce and complaint processing of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacCVE-2026-107579 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.5
Inefficient algorithmic complexity in the bounce and complaint processing of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to stop mail delivery by sending messages, when bounce processing or complaint processing is enabled or a mailing list is managed by the server (none is by default). The readers of incoming delivery status notifications (RFC 3464) and abuse feedback reports (RFC 5965) removed the blank lines at the start of the returned headers part two bytes at a time, copying the rest of the part each time, so their work grew with the square of the number of blank lines. A message shaped like such a report, whose headers part begins with a very large number of blank lines within the reader's 2 MB limit, keeps a delivery thread busy for over a minute while it is delivered, and a few such messages a minute keep every delivery thread busy.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Improper link resolution and external control of file paths in the administrative command-line operations of hMailServer.exe in Progressive Robot hMailServer 6.CVE-2026-107578 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.7
Improper link resolution and external control of file paths in the administrative command-line operations of hMailServer.exe in Progressive Robot hMailServer 6.3.4 and 6.3.5 allow a local attacker who already runs code as the low-privilege service account to escalate privilege. On Windows, operations run with administrator rights by the installer, DBSetup, the Control Panel or an administrator wrote log entries and crash records into the log folder, created, deleted and changed the permissions of the self-signed certificate and private key in the data folder, and rewrote message files in the data folder, all by path in folders the service account (NT SERVICE\hMailServer, the default for new installations since 6.3.4) can modify, following junctions and mount points; and the store-maintenance operations reached files by names taken from the database, which the service account can write, including names outside the data folder. On Linux, the store-maintenance and object-storage operations run as root followed symbolic links the service account (the packaged hmailserver user, which owns the data folder) planted in it, so a root-run operation read, wrote or removed the link's target as
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 aCVE-2026-107577 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.5
Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote unauthenticated attacker to make the mail services unavailable by sending a message. Removing a MIME header parameter whose value is empty and directly followed by a semicolon (for example a Content-Disposition with 'filename=a.bat; filename=;') entered a loop that never terminates, holding a worker thread at full load until the server is restarted; this is reached when the attachment blocker renames a blocked attachment or a filename is set over the REST API. Separately, decoding a header field that holds many RFC 2047 encoded words of an encoding other than base64 or quoted-printable, removing a parameter with many RFC 2231 continuations, and deleting many header fields of one name each took time growing with the square of the message, on the small thread pools that serve IMAP, SMTP and POP3 connections, delivery and the REST API.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the inbound DKIM and ARC signature verification of Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unautCVE-2026-107576 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.5
Inefficient algorithmic complexity in the inbound DKIM and ARC signature verification of Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticated attacker to make the mail services unavailable by sending a message. Building the canonical header and choosing the header fields named in a signature's h= tag took time growing with the square of the message's header: the 'simple' canonicalisation prepended each continuation line of a folded field to the lines already gathered, and both canonicalisations searched the gathered fields from the bottom for each h= name and erased the match from the middle of the list. A message whose header holds very many fields, or a field folded over very many lines, with a DKIM-Signature the attacker signs for a domain they control, keeps a worker thread busy for tens of seconds per signature; up to ten signatures are evaluated per message by each of the DKIM and DMARC tests, on the threads that serve delivery and SMTP.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the SPF macro expansion of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to consuCVE-2026-107575 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 5.3
Inefficient algorithmic complexity in the SPF macro expansion of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to consume worker-thread time by publishing a crafted SPF record. RFC 7208 section 7.1 requires a name too long to look up to lose whole labels from the left; the server did this by removing one label at a time and copying the rest of the name each time, so the work grew with the square of the expansion. An attacker who publishes an SPF record for a domain they control, with a mechanism whose domain-spec expands through macros to a name far longer than 253 characters, makes the SPF check of a message from that domain take several seconds. The expansion is bounded by SPF's own per-term and per-macro limits, so the loss of availability is partial.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient algorithmic complexity in the JSON reader of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the mail services unavaiCVE-2026-107574 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.5
Inefficient algorithmic complexity in the JSON reader of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the mail services unavailable. Reading a JSON object kept the first of each duplicated member name by searching the members already read, so an object of N distinct member names cost O(N^2): 1 MB took 8.9 seconds and 4 MB took 300 seconds against the affected code. A remote attacker reaches the reader without an account by mailing a crafted TLS-RPT report (up to 16 MB after decompression) to a hosted domain's published report mailbox, which is read on a delivery thread; a few such reports hold every delivery thread (ten by default), so the server delivers no mail, local or outbound, for over an hour per report. A signed-in account reaches the same 16 MB body through the webmail's own REST routes, holding the REST API's own worker threads. Where no report mailbox is configured, the unauthenticated REST sign-in routes that read a JSON body are capped at 64 KB and are not affected.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a local authenticated user to read the mail seCVE-2026-107573 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.8
Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a local authenticated user to read the mail server's data. The installer created the data, log, temp, database and event folders and the hMailServer.INI configuration file with the permissions inherited from the installation folder, by default under Program Files, which give the local Users group read access. Any user who can sign in to the computer could read every stored message, the logs, the built-in database with the accounts' password hashes whenever the service is stopped, and the configuration file, including the database password, which is sealed only with the machine's DPAPI key and can be unsealed by any local account; with an external database that password gives full control of it. The Linux AppImage of 6.3.0 through 6.3.5 likewise created its per-user data folders readable by other local users.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Inefficient complexity in the Sieve filter evaluation of Progressive Robot hMailServer 6.2.24 through 6.3.5 allows an authenticated account holder to make the mCVE-2026-107572 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.5
Inefficient complexity in the Sieve filter evaluation of Progressive Robot hMailServer 6.2.24 through 6.3.5 allows an authenticated account holder to make the mail services unavailable with their own filter. A ':matches' pattern was matched by a backtracking descent whose time grew with the matched value's length raised to the number of wildcards, so a pattern such as '*a*a*a*b' over 800 characters took 44 seconds; and 'deleteheader' erased the fields it removed one at a time, so removing many fields of one name over a message's header cost O(N^2) (80,000 fields took 18.8 seconds). Sieve filters run on the small, shared delivery thread pool, so an account holder whose active script does this, fed a few messages they can send themselves, empties the pool and stops delivery for the whole server. The script is the account holder's own and cannot be set for another user.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026heap OOB write in convert_file_from_to() via a crafted Content-Type header allows attacker to OOB write when email is used as a template.CVE-2026-107570 · Other software · mutt · reported by cve@gitlab.comLow 2.5
heap OOB write in convert_file_from_to() via a crafted Content-Type header allows attacker to OOB write when email is used as a template.
- Product
- mutt
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgitlab.comopenwall.com
Oct 8, 2026Progressive Robot hMailServer 6.0.0 through 6.3.5 does not enforce TLS for outbound SMTP delivery to a mail exchanger whose DNSSEC-validated TLSA records contaiCVE-2026-104704 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.4
Progressive Robot hMailServer 6.0.0 through 6.3.5 does not enforce TLS for outbound SMTP delivery to a mail exchanger whose DNSSEC-validated TLSA records contain no DANE-EE (usage 3) record, contrary to RFC 7672 section 2.2. The server used only DANE-EE records and treated a validated TLSA record set consisting of DANE-TA (usage 2) or otherwise unusable records as if no records were published, so delivery to such a host fell back to opportunistic TLS. An attacker with an active position on the network path between the server and the recipient's mail exchanger can suppress or break the STARTTLS negotiation and cause messages to be delivered in cleartext, where they can be read and modified.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Missing authorization on COM objects in Progressive Robot hMailServer 6.0.0 through 6.3.5 (Windows only) lets a local interactive user with no hMailServer credeCVE-2026-104660 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.8
Missing authorization on COM objects in Progressive Robot hMailServer 6.0.0 through 6.3.5 (Windows only) lets a local interactive user with no hMailServer credential read and write arbitrary files as the service account and queue mail as any sender. The service registers its COM classes with no DCOM access or launch permission and calls CoInitializeSecurity with no security descriptor, so any user logged on at the console or over Remote Desktop can activate the classes in the running service; a hMailServer.Message, its Attachments and Attachment, and a hMailServer.FetchAccount created this way carry a credential that never authenticated. Attachments.Add(path) and Attachment.SaveAs(path) performed no authorization check, and Message.Save/Copy and FetchAccount.AccountID/Save performed none either up to 6.3.3 and from 6.3.4 treated a holder with no credential as the server's own event-script host. Because the service does not impersonate the COM caller, Attachments.Add reads any file the service account can read and returns it, Attachment.SaveAs writes attacker-chosen bytes to any path it can write (on a LocalSystem installation, code execution as SYSTEM), Message.Save queues outbound
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Missing Host header validation and missing throttling of failed administrator sign-ins in the REST API listener of Progressive Robot hMailServer 6.0.0 through 6CVE-2026-104659 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.5
Missing Host header validation and missing throttling of failed administrator sign-ins in the REST API listener of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote attacker to brute-force the server administrator's password through the administrator's own browser by DNS rebinding. The listener, which is off by default and bound to the loopback when enabled, answered requests whatever their Host header named, and a failed sign-in with the administrator's password from the loopback was neither auto-banned nor delayed. A web page whose host name the attacker rebinds to 127.0.0.1, opened in a browser on the server, can therefore send authenticated requests to the listener, read the answers and try administrator passwords at full speed until one is accepted, giving the attacker full administrative control of the mail server.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026The Linux live-update apply helper (hmailserver-update) of Progressive Robot hMailServer 6.3.4 and 6.3.5 runs as root on a request file written by the unprivileCVE-2026-104658 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.8
The Linux live-update apply helper (hmailserver-update) of Progressive Robot hMailServer 6.3.4 and 6.3.5 runs as root on a request file written by the unprivileged hmailserver service account, and took from that request the program used to verify an AppImage update's signature and the systemd unit to stop before reading the service account's files. An attacker who already runs code as the hmailserver service account, for example through another flaw in the mail server, can therefore have arbitrary code executed as root, on any Linux installation where the live update's path unit is active - the default for the project's .deb and .rpm packages - and on AppImage installations run under that unit.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Missing network timeouts in the Linux builds of Progressive Robot hMailServer 6.3.0 through 6.3.5 allow a remote attacker to hold server threads indefinitely anCVE-2026-103649 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.5
Missing network timeouts in the Linux builds of Progressive Robot hMailServer 6.3.0 through 6.3.5 allow a remote attacker to hold server threads indefinitely and so stop outbound mail delivery (denial of service). The server set its socket timeouts in the form Windows takes, which Linux refuses, and its HTTPS clients read without a deadline, so a peer that accepts a connection and then sends nothing held the waiting thread for as long as the connection stayed open. The MTA-STS policy fetch, enabled by default, is made during outbound delivery to mta-sts.<recipient domain>, so anyone who can make the server deliver mail to a domain they control - for example as the envelope sender of a message that bounces - can hold delivery threads until outbound delivery stops. The same flaw affects the DANE TLSA query, the OAuth2 token request, the ACME client, and the ManageSieve and metrics listeners, which a silent client stops from serving anyone else. Windows builds are not affected.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Cross-site scripting in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote attacker who can send a user an encrypted message to ruCVE-2026-103647 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 8
Cross-site scripting in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote attacker who can send a user an encrypted message to run script in the webmail's origin with that user's session. When the webmail decrypted an S/MIME message (from 6.3.2) or an OpenPGP message (from 6.3.4) in the browser, it offered each decrypted attachment as a blob URL of the media type the message declared for it. A click saved the file, but if the user opened the attachment in a new tab, a part declared as text/html was rendered as a document of the webmail's origin and its script could read the mailbox, send mail and change the account through the REST API. The webmail is served only when the REST API is enabled, which it is not by default.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Heap-based buffer overflow in the legacy Blowfish encryption routine (BlowFishEncryptor::Encode, called by EncryptToString) in Progressive Robot hMailServer 6.0CVE-2026-103011 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comMedium 6.5
Heap-based buffer overflow in the legacy Blowfish encryption routine (BlowFishEncryptor::Encode, called by EncryptToString) in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows an authenticated mailbox user to cause a denial of service (service crash), and possibly other unspecified impact. In 6.3.4 and 6.3.5, where the self-service REST API is enabled (it is off by default), the user does this remotely by adding a fetch account whose password is 129 to 247 characters long and not a multiple of 8, and then requesting their personal data export (GET /api/v1/me/export.zip), which encrypts that password with the legacy scheme. The same flaw is reachable on Windows by any local interactive user with no hMailServer credentials, through the COM method Utilities.BlowfishEncrypt, which checked no authentication. It is also reachable by every stored-secret write when ProtectStoredSecretsWithDPAPI is set to 0. For such a length, the routine's padding loop writes up to 7 zero bytes 2 to 232 bytes past the end of its 255-byte heap buffer. The ciphertext it returns is still correct.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026Heap-based buffer overflow in the legacy Blowfish decryption routine (BlowFishEncryptor::DecryptFromString) in Progressive Robot hMailServer 6.0.0 through 6.3.3CVE-2026-103010 · Other software · Progressive Robot Ltd · reported by cve@gitlab.comHigh 7.8
Heap-based buffer overflow in the legacy Blowfish decryption routine (BlowFishEncryptor::DecryptFromString) in Progressive Robot hMailServer 6.0.0 through 6.3.3 on Windows allows a local interactive user with no hMailServer credentials to write bytes of their choosing past the end of a 255-byte heap buffer in the hMailServer service process, which runs as LocalSystem by default. The user does this by passing a long hexadecimal string to the COM method Utilities.BlowfishDecrypt, which checked no authentication. The routine converted hexadecimal input of any length into a fixed 255-byte buffer before decrypting it in place. The result is a denial of service (service crash), and possibly code execution with the privileges of the service account.
- Product
- hMailServer
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 8, 2026A vulnerability has been identified regarding insufficient validation in the Frappe Cloud/ERPNext authentication process, which allows multiple email addresses CVE-2026-4894 · Other software · Frappe Technologies · reported by cve-coordination@incibe.esMedium 6.9
A vulnerability has been identified regarding insufficient validation in the Frappe Cloud/ERPNext authentication process, which allows multiple email addresses to be accepted by manipulating the email field in the /api/method/press.api.account.signup endpoint. The vulnerability occurs when an unauthenticated remote attacker adds more than one email address. The service processes the entire value as a valid list of recipients and sends the OTP code to all addresses without proper validation of all added emails (only one of them needs to be valid). Exploiting this vulnerability would allow an attacker to: * Obtain the authentication OTP; * Impersonate someone else in the registration process; * Register accounts using other people's email addresses without access to the mailbox; * Indirectly confirm the existence of already registered email addresses.
- Product
- Frappe Technologies
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 7, 2026Authenticated users are able to manipulate both the SMTP envelope “Envelope-from” and “From” fields when sending emails through OVH mail servers.CVE-2026-33586 · Other software · OVHcloud · reported by a6d3dc9e-0591-4a13-bce7-0f5b31ff6158Medium 6.3
Authenticated users are able to manipulate both the SMTP envelope “Envelope-from” and “From” fields when sending emails through OVH mail servers. Due to OVH's default SPF configuration, which commonly includes include:mx.ovh.com, any authenticated user with a valid OVH email account can send messages that appear to originate from any OVH-hosted domains using the default SPF record. Since the SPF policy explicitly authorizes OVH mail servers (mx.ovh.com) to send mail on behalf of these domains, forged messages successfully pass SPF validation despite not being authorized by the impersonated domain owner.
- Product
- OVHcloud
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 7, 2026MISP contains a race condition in the email-based one-time password (OTP) login flow.CVE-2026-107276 · Other software · MISP · reported by 5a6e4751-2f3f-4070-9419-94fb35b644e8Medium 6.3
MISP contains a race condition in the email-based one-time password (OTP) login flow. When two HTTP requests carrying the same valid OTP are submitted concurrently, both can successfully authenticate and establish a session. The root cause is that the OTP value is read from the shared store, validated, and then deleted in separate non-atomic steps, allowing a second in-flight request to read the same value before the first request's deletion takes effect. Preconditions: - The target MISP instance has email OTP login enabled. - The attacker possesses a valid, unexpired OTP (e.g., via email interception or social engineering). - The attacker can issue two HTTP POST requests in close temporal proximity. Impact: - The one-time-use guarantee of the OTP is violated; a single code can yield two authenticated sessions. - This weakens the authentication control and may facilitate unauthorized access if the OTP is shared or intercepted. Affected versions: <2.5.48
- Product
- MISP
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 7, 2026A path traversal vulnerability exists in the EmailSheet extract_parts functionality of VisiData (version(s): dev (commit 38b21f78)).CVE-2026-42532 · Other software · visidata · reported by talos-cna@cisco.comMedium 5.5
A path traversal vulnerability exists in the EmailSheet extract_parts functionality of VisiData (version(s): dev (commit 38b21f78)). A specially crafted .eml file can lead to arbitrary file write. An attacker can provide a malicious file to trigger this vulnerability.
- Product
- visidata
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 7, 2026A flaw was found in the SMTP email configuration handling of the keycloak-services component.CVE-2026-107121 · Other software · Red Hat · reported by Red HatMedium 6.5
A flaw was found in the SMTP email configuration handling of the keycloak-services component. When the STARTTLS option is enabled, Keycloak fails to strictly enforce an encrypted connection, allowing it to fall back to unencrypted communication if the encryption request is tampered with. An attacker who can intercept network traffic can exploit this to capture sensitive email credentials and message content in plain text.
- Product
- Red Hat Build of Keycloak
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordaccess.redhat.combugzilla.redhat.com
Oct 7, 2026User Private Files: Does not validate that a supplied user belongs to the document being operated on before returning that user's email addressCVE-2026-97331 · WordPress plugins & themes · reported by WPScanMedium 4.3
The User Private Files WordPress plugin before 2.1.9 does not validate that a supplied user belongs to the document being operated on before returning that user's email address, allowing any authenticated user, such as a Subscriber, to obtain the email address of any registered account, including administrators.
- Product
- User Private Files
- Fixed in
- 2.1.9
- What to do
- Update User Private Files to 2.1.9 or newer.
Oct 7, 2026MetForm: Does not sanitize or escape submitted form-field values before inserting them into the HTML body of its email notificationsCVE-2026-86833 · WordPress plugins & themes · reported by WPScanMedium 5.4
The MetForm WordPress plugin before 4.3.1 does not sanitize or escape submitted form-field values before inserting them into the HTML body of its email notifications, allowing unauthenticated attackers to inject arbitrary markup into the administrator and submitter notification emails the site sends.
- Product
- MetForm
- Fixed in
- 4.3.1
- What to do
- Update MetForm to 4.3.1 or newer.
Oct 6, 2026Improper Control of Interaction Frequency vulnerability in Pusula Communication, IT, and Internet Industry and Trade Co.CVE-2026-82924 · Other software · Pusula Communication, IT, and Internet Industry and Trade Co. Ltd. · reported by iletisim@usom.gov.trMedium 5.3
Improper Control of Interaction Frequency vulnerability in Pusula Communication, IT, and Internet Industry and Trade Co. Ltd. Expert Mail allows Brute Force. This issue affects Expert Mail: through 2026-09-18.
- Product
- Expert Mail
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 6, 2026Unauthenticated SQL Injection in Newsletter Subscription Form – User Subscriptions Form, Capture Email <= 1.5.9 versions.CVE-2026-41555 · WordPress plugins & themes · reported by PatchstackCritical 9.3
Unauthenticated SQL Injection in Newsletter Subscription Form – User Subscriptions Form, Capture Email <= 1.5.9 versions.
- Affected
- up to 1.5.9
- What to do
- Affects up to 1.5.9. Update the plugin to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Oct 6, 2026Unauthenticated Sensitive Data Exposure in Mailjet Email Marketing <= 6.2.3 versions.CVE-2026-39791 · WordPress plugins & themes · reported by PatchstackMedium 5.3
Unauthenticated Sensitive Data Exposure in Mailjet Email Marketing <= 6.2.3 versions.
- Affected
- up to 6.2.3
- What to do
- Affects up to 6.2.3. Update the plugin to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Oct 6, 2026Unauthenticated Cross Site Scripting (XSS) in WP Mailster <= 1.9.0.0 versions.CVE-2026-105061 · WordPress plugins & themes · reported by PatchstackHigh 7.1
Unauthenticated Cross Site Scripting (XSS) in WP Mailster <= 1.9.0.0 versions.
- Affected
- up to 1.9.0.0
- What to do
- Affects up to 1.9.0.0. Update the plugin to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Oct 6, 2026Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App: Stored Cross-Site ScriptingCVE-2026-75962 · WordPress plugins & themes · reported by WordfenceHigh 7.2
The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable without authentication on WordPress Multisite installations with public registration enabled, as WordPress accepts email addresses containing numeric HTML character references that Post SMTP's stricter validator rejects, persisting the attacker-controlled address verbatim to the email log via the failed-send exception message.
- Product
- Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
- Affected
- up to 4.0.1
- What to do
- Affects up to 4.0.1. Update Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Full record and what to do →NVD recordplugins.trac.wordpress.orgplugins.trac.wordpress.org
Oct 5, 2026The email media type OAuth form passes the Authorization endpoint value to window.open() without validating the URL scheme, so a javascript: URL is executed in CVE-2026-59788 · Other software · Zabbix · reported by security@zabbix.comMedium 5.7
The email media type OAuth form passes the Authorization endpoint value to window.open() without validating the URL scheme, so a javascript: URL is executed in the browser. This means a crafted media type configuration, deliverable as an import file, runs arbitrary JavaScript as the Super Admin who grants consent.
- Product
- Zabbix
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 5, 2026WP Mailster: Missing AuthorizationCVE-2026-105055 · WordPress plugins & themes · reported by PatchstackMedium 5.3
Missing Authorization vulnerability in WP Mailster WP Mailster wp-mailster allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP Mailster: from n/a through 1.9.0.0.
- Product
- WP Mailster
- Affected
- up to 1.9.0.0
- What to do
- Affects up to 1.9.0.0. Update WP Mailster to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Oct 3, 2026LaraDashboard 1.4.2 before 1.4.8 applies advanced email validation to unauthenticated forgot-password and reset-password requests, triggering DNS lookups and paCVE-2026-105127 · Other software · laradashboard · reported by VulnCheckMedium 6.9
LaraDashboard 1.4.2 before 1.4.8 applies advanced email validation to unauthenticated forgot-password and reset-password requests, triggering DNS lookups and paid AbstractAPI verification calls. Unauthenticated attackers can submit arbitrary addresses to exhaust the verification quota, making validation fail open for all public forms, and probe domain resolution.
- Product
- laradashboard
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 3, 2026OpenAM before 16.1.3 contains an email content injection vulnerability that allows unauthenticated attackers to control notification email wording via the forgoCVE-2026-105117 · Other software · OpenIdentityPlatform · reported by VulnCheckMedium 5.3
OpenAM before 16.1.3 contains an email content injection vulnerability that allows unauthenticated attackers to control notification email wording via the forgotPassword and register actions on /json/{realm}/users. Attackers can supply subject and message fields to send phishing mail from the organisation's configured From address, or abuse register as a relay to arbitrary recipients.
- Product
- OpenAM
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 3, 2026Mail logging – WP Mail Catcher: Stored Cross-Site ScriptingCVE-2026-93889 · WordPress plugins & themes · reported by WordfenceHigh 7.2
The Mail logging – WP Mail Catcher plugin for WordPress is vulnerable to Stored Cross-Site Scripting via PHPMailer 'wp_mail_failed' Error Message in all versions up to, and including, 2.1.12 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful exploitation requires a separately installed plugin, such as Contact Form 7, that passes unauthenticated user-controlled input into mail fields whose content PHPMailer will include in its failure error message.
- Product
- Mail logging – WP Mail Catcher
- Affected
- up to 2.1.12
- What to do
- Affects up to 2.1.12. Update Mail logging – WP Mail Catcher to the newest version and check its changelog mentions this fix; if there isn’t one yet, deactivate it until there is.
Full record and what to do →NVD recordplugins.trac.wordpress.orgplugins.trac.wordpress.org
Oct 3, 2026Mailchimp for WooCommerce: Does not require authenticationCVE-2026-92437 · WordPress plugins & themes · reported by WPScanMedium 5.3
The Mailchimp for WooCommerce WordPress plugin before 6.3 does not require authentication, a nonce or an ownership check before it acts on a customer's abandoned-cart record identified from request-supplied data, allowing an unauthenticated attacker to modify or delete another customer's stored cart.
- Product
- Mailchimp for WooCommerce
- Fixed in
- 6.3
- What to do
- Update Mailchimp for WooCommerce to 6.3 or newer.
Oct 2, 2026UTMStack before 11.2.16 contains an account enumeration vulnerability that allows unauthenticated attackers to determine registered email addresses by observingCVE-2026-82043 · Other software · UTMStack · reported by VulnCheckMedium 6.9
UTMStack before 11.2.16 contains an account enumeration vulnerability that allows unauthenticated attackers to determine registered email addresses by observing differing HTTP responses from the POST /api/account/reset-password/init endpoint. Attackers can submit arbitrary email addresses and distinguish registered accounts, which return 200 OK, from unregistered accounts, which trigger a 500 Internal Server Error with backend error details, enabling targeted phishing or credential attacks.
- Product
- UTMStack
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 2, 2026YesWiki before 4.6.7 contains an authentication bypass in the contact mail AJAX handler that allows unauthenticated attackers to send email through the wiki's SCVE-2026-104446 · Other software · YesWiki · reported by VulnCheckMedium 6.9
YesWiki before 4.6.7 contains an authentication bypass in the contact mail AJAX handler that allows unauthenticated attackers to send email through the wiki's SMTP server. Attackers can POST an XMLHttpRequest to the mail handler without field or type parameters, supplying arbitrary recipient, sender, subject and body for spam and phishing.
- Product
- yeswiki
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Oct 2, 2026YesWiki before 4.6.7 contains a user enumeration vulnerability in LostPasswordAction.php that allows unauthenticated attackers to confirm registered email addreCVE-2026-104439 · Other software · YesWiki · reported by VulnCheckHigh 7.1
YesWiki before 4.6.7 contains a user enumeration vulnerability in LostPasswordAction.php that allows unauthenticated attackers to confirm registered email addresses through differing responses. Attackers can submit emails to the MotDePassePerdu recovery page without rate limiting to identify valid accounts for targeted phishing or password-spraying.
- Product
- yeswiki
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comvulncheck.com
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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