Updated 2 h ago

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.

1,762exploited flaws on CISA’s list

34added in the last 30 days

344new WordPress flaws this week

390,080entries in the database

4,194 results · page 4 of 84

Oct 27, 2026Use-after-free in the DOM: HTML Parser component.CVE-2026-117883 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the Layout component.CVE-2026-117882 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-117881 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the XML component.CVE-2026-117880 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Incorrect boundary conditions in the Layout: Tables component.CVE-2026-117879 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Incorrect boundary conditions in the Layout: Tables component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Other issue, use-after-free in the Storage: IndexedDB component.CVE-2026-117878 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Other issue, use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the Layout: Text and Fonts component.CVE-2026-117877 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the Layout: Text and Fonts component.CVE-2026-117876 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the Layout: Scrolling and Overflow component.CVE-2026-117875 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the Layout: Scrolling and Overflow component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the Internationalization component.CVE-2026-117874 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the Internationalization component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Incorrect boundary conditions in the Audio/Video: Playback component.CVE-2026-117873 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the JavaScript: Standard Library component.CVE-2026-117872 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the JavaScript: Standard Library component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Invalid pointer in the Graphics component.CVE-2026-117871 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the JavaScript Engine component.CVE-2026-117870 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the DOM: Core & HTML component.CVE-2026-117869 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Sandbox escape in the DOM: Networking component.CVE-2026-117868 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Sandbox escape in the DOM: Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the Layout component.CVE-2026-117867 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Privilege escalation due to use-after-free in the Graphics: Canvas2D component.CVE-2026-117866 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Use-after-free in the JavaScript: GC component.CVE-2026-117865 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Sandbox escape in the Form Manager component.CVE-2026-117864 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Sandbox escape in the Form Manager component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Information disclosure due to uninitialized memory in the Audio/Video component.CVE-2026-117863 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Information disclosure due to uninitialized memory in the Audio/Video component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Privilege escalation due to incorrect boundary conditions in the Networking component.CVE-2026-117862 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Privilege escalation due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Sandbox escape in the DOM: Navigation component.CVE-2026-117861 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 27, 2026Same-origin policy bypass in the DOM: Navigation component.CVE-2026-117860 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 26, 2026A malicious web page could insert arbitrary text into the FaceTime call prompt shown by iOS, potentialy allowing it to display a phishing message inside system CVE-2026-116632 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
A malicious web page could insert arbitrary text into the FaceTime call prompt shown by iOS, potentialy allowing it to display a phishing message inside system UI. This vulnerability was fixed in Firefox for iOS 156.1.
Product
Firefox for iOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 26, 2026A malicious web page could open a tel link in a window that was showing a different website, causing the phone-call prompt to appear as if that site had requestCVE-2026-116631 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
A malicious web page could open a tel link in a window that was showing a different website, causing the phone-call prompt to appear as if that site had requested the call. This vulnerability was fixed in Firefox for iOS 156.1.
Product
Firefox for iOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 24, 2026BigFix Platform uses Mozilla CA certificate bundle (PEM).CVE-2026-108013 · Other software · HCL Software · reported by psirt@hcl.comMedium 6.8
BigFix Platform uses Mozilla CA certificate bundle (PEM). Versions of the bundle dated before 2026/10/20 still trust certificates whose private keys have been compromised. When BigFix Platform validates servers using such a bundle, an on-path attacker can impersonate remote servers and tamper with files downloaded by the application. The issue is resolved by using bundle version 2026/10/20 or later. The fixed bundle is available starting from BES Support v1520.
Product
BigFix Platform
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record support.hcl-software.com
Oct 20, 2026Mozilla::CA versions before 20261020 for Perl provide a CA certificate bundle containing a root linked to compromised intermediates.CVE-2026-113812 · Other software · reported by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Mozilla::CA versions before 20261020 for Perl provide a CA certificate bundle containing a root linked to compromised intermediates. The bundle includes "emSign ECC Root CA - G3", which provides a trust path for intermediate certificates whose private keys are publicly available. An attacker able to intercept or redirect client traffic may use these keys to impersonate a TLS server. LWP, HTTP::Tiny and other clients normally use IO::Socket::SSL, which looks for CA certificates in OpenSSL's default locations before falling back to Mozilla::CA. Configuration and environment variables can override this selection. Users should check which CA store their client uses. If it uses the system store, check for and install the operating system vendor's updates for this incident.
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org emudhra.we-have-a-problem.com
Oct 20, 2026When Thunderbird asked for a security device password (for example a smartcard PIN or the Primary Password) while decrypting an S/MIME message, the message loadCVE-2026-113869 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
When Thunderbird asked for a security device password (for example a smartcard PIN or the Primary Password) while decrypting an S/MIME message, the message load could finish or be cancelled while the prompt was open. This freed the message decoder while it was still in use, causing a use-after-free and a potentially exploitable crash. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.6.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026When authenticating to a POP3 or SMTP server using NTLM, Thunderbird did not check whether the server's challenge was valid base64.CVE-2026-113868 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.3
When authenticating to a POP3 or SMTP server using NTLM, Thunderbird did not check whether the server's challenge was valid base64. A malicious server could send a challenge that caused Thunderbird to include uninitialized heap memory in its NTLM response, disclosing that memory to the server. A challenge consisting only of base64 padding also caused an out-of-bounds read, crashing Thunderbird. This affected accounts configured to use NTLM or GSSAPI authentication. The uninitialized memory disclosure only affected NTLM. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas.CVE-2026-113867 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Thunderbird did not escape attribute values when serializing outgoing XMPP stanzas. Because values from incoming requests were echoed back in automatic replies, a remote XMPP user could send a crafted request that caused Thunderbird to inject arbitrary stanzas into the user's connection, which the server would then process as if sent by the user. This could be used to send messages or change contact and subscription settings on behalf of the user, without any interaction. This bug only affects Thunderbird's chat feature with XMPP accounts. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP.CVE-2026-113866 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.9
When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026Cryptographic issue in the Security Block-lists, Allow-lists, and other State component.CVE-2026-113470 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Cryptographic issue in the Security Block-lists, Allow-lists, and other State component. This vulnerability was fixed in Firefox 158.0.1, Firefox ESR 153.5.1, Firefox ESR 115.43.1, Thunderbird 158.0.1, Thunderbird 153.5.1, and Firefox 158.0.2.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026Denial-of-service in the PDF Viewer component.CVE-2026-113401 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026Uninitialized memory in the Audio/Video: cubeb component.CVE-2026-113400 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.4
Uninitialized memory in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 20, 2026Incorrect boundary conditions in the SVG component.CVE-2026-113399 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep CVE-2026-110249 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.6
A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.5.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks.CVE-2026-110247 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.4
Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks. On a sufficiently large message the growth guard could fail open, or the buffer could be reallocated smaller than required, and a subsequent memcpy would then write attacker-controlled data across adjacent heap allocations. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.6.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Mitigation bypass in the File Handling component.CVE-2026-109783 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.3
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Mitigation bypass in the File Handling component.CVE-2026-109782 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.3
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Denial-of-service in the Printing: Output component.CVE-2026-109781 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Denial-of-service in the Printing: Output component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Mitigation bypass in the DOM: Core & HTML component.CVE-2026-109780 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Race condition in the Networking: DNS component.CVE-2026-109779 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.2
Race condition in the Networking: DNS component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Privilege escalation in the WebExtensions component.CVE-2026-109778 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Information disclosure in the Storage: IndexedDB component.CVE-2026-109777 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Race condition in the XPCOM component.CVE-2026-109776 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.2
Race condition in the XPCOM component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Denial-of-service in the WebRTC component.CVE-2026-109775 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Denial-of-service in the WebRTC component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Invalid pointer, undefined behavior in the DOM: Notifications component.CVE-2026-109774 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Invalid pointer, undefined behavior in the DOM: Notifications component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Denial-of-service in the Sync component.CVE-2026-109773 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Denial-of-service in the Sync component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 13, 2026Same-origin policy bypass in the DevTools component.CVE-2026-109772 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.1
Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org

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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