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.
18 results
Oct 27, 2026Sandbox escape due to use-after-free in the XPCOM component.CVE-2026-118021 · Computers, phones & browsers · Mozilla · reported by security@mozilla.org
Sandbox escape due to use-after-free in the XPCOM component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordbugzilla.mozilla.orgmozilla.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 recordbugzilla.mozilla.orgmozilla.org
Sep 29, 2026Sandbox escape due to incorrect boundary conditions in the XPCOM component.CVE-2026-100819 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.6
Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordbugzilla.mozilla.orgmozilla.org
Mar 24, 2026Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component.CVE-2026-4690 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.6
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordbugzilla.mozilla.orgmozilla.org
Mar 24, 2026Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component.CVE-2026-4689 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 10
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordbugzilla.mozilla.orgmozilla.org
Jun 2, 2023When encoding data from an <code>inputStream</code> in <code>xpcom</code> the size of the input being encoded was not correctly calculated potentially leading tCVE-2023-25732 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
When encoding data from an <code>inputStream</code> in <code>xpcom</code> the size of the input being encoded was not correctly calculated potentially leading to an out of bounds memory write. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordbugzilla.mozilla.orgmozilla.org
Nov 5, 2019Nvu 0.99+1.0pre uses an old copy of Mozilla XPCOM which can result in multiple security issues.CVE-2005-2354 · Other software · NVU · reported by security@debian.orgCritical 9.8
Nvu 0.99+1.0pre uses an old copy of Mozilla XPCOM which can result in multiple security issues.
- Product
- NVU
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordattrition.orgbugs.debian.org
Nov 29, 2016In framework/modules/core/controllers/expCommentController.php of Exponent CMS 2.4.0, content_id input is passed into showComments.CVE-2016-9481 · Other software · Exponentcms · reported by MITRECritical 9.8
In framework/modules/core/controllers/expCommentController.php of Exponent CMS 2.4.0, content_id input is passed into showComments. The method showComments is defined in the expCommentControllercontroller with the parameter '$this->params['content_id']' used directly in SQL. Impact is a SQL injection.
- Product
- Exponent CMS
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordpang0lin.comsecurityfocus.com
Aug 4, 2016Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackerCVE-2016-5259 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.opensuse.orglists.opensuse.org
Dec 16, 2015Buffer overflow in the nsDeque::GrowCapacity function in xpcom/glue/nsDeque.cpp in Mozilla Firefox before 43.0 might allow remote attackers to cause a denial ofCVE-2015-7221 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 10
Buffer overflow in the nsDeque::GrowCapacity function in xpcom/glue/nsDeque.cpp in Mozilla Firefox before 43.0 might allow remote attackers to cause a denial of service or possibly have unspecified other impact by triggering a deque size change.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.fedoraproject.orglists.fedoraproject.org
Jul 5, 2015Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 aCVE-2015-2733 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 10
Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a dedicated worker.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.opensuse.orglists.opensuse.org
Jul 5, 2015Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 aCVE-2015-2722 · Other software · Oracle · reported by security@mozilla.orgHigh 10
Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a shared worker.
- Product
- Solaris
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.opensuse.orglists.opensuse.org
Sep 18, 2014The psicofxp (aka com.tapatalk.psicofxpcom) application 2.4.12.15 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middlCVE-2014-5947 · Other software · Psicofxp · reported by cret@cert.orgMedium 5.4
The psicofxp (aka com.tapatalk.psicofxpcom) application 2.4.12.15 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
- Product
- Psicofxp
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordkb.cert.orgkb.cert.org
Jan 7, 2010The nsObserverList::FillObserverArray function in xpcom/ds/nsObserverList.cpp in Mozilla Firefox before 3.5.7 allows remote attackers to cause a denial of serviCVE-2010-0220 · Computers, phones & browsers · Mozilla · reported by MITREMedium 5
The nsObserverList::FillObserverArray function in xpcom/ds/nsObserverList.cpp in Mozilla Firefox before 3.5.7 allows remote attackers to cause a denial of service (application crash) via a crafted web site that triggers memory consumption and an accompanying Low Memory alert dialog, and also triggers attempted removal of an observer from an empty observers array.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordhg.mozilla.orgisc.sans.org
Oct 29, 2009The XPCVariant::VariantDataToJS function in the XPCOM implementation in Mozilla Firefox 3.0.x before 3.0.15 and 3.5.x before 3.5.4 does not enforce intended resCVE-2009-3374 · Computers, phones & browsers · Mozilla · reported by MITREHigh 7.5
The XPCVariant::VariantDataToJS function in the XPCOM implementation in Mozilla Firefox 3.0.x before 3.0.15 and 3.5.x before 3.5.4 does not enforce intended restrictions on interaction between chrome privileged code and objects obtained from remote web sites, which allows remote attackers to execute arbitrary JavaScript with chrome privileges via unspecified method calls, related to "doubly-wrapped objects."
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsunsolve.sun.commandriva.com
Nov 13, 2008Integer overflow in xpcom/io/nsEscape.cpp in the browser engine in Mozilla Firefox 3.x before 3.0.4, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.1CVE-2008-5017 · Computers, phones & browsers · Mozilla · reported by Red HatHigh 10
Integer overflow in xpcom/io/nsEscape.cpp in the browser engine in Mozilla Firefox 3.x before 3.0.4, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) via unknown vectors.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.opensuse.orgsecunia.com
Sep 23, 2005Firefox before 1.0.7 and Mozilla Suite before 1.7.12 allows remote attackers to spoof DOM objects via an XBL control that implements an internal XPCOM interfaceCVE-2005-2704 · Computers, phones & browsers · Mozilla · reported by Red HatMedium 5
Firefox before 1.0.7 and Mozilla Suite before 1.7.12 allows remote attackers to spoof DOM objects via an XBL control that implements an internal XPCOM interface.
- Product
- Firefox
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordftp.sco.comsecunia.com
Aug 3, 2005Race condition in the xpcom library, as used by web browsers such as Firefox, Mozilla, Netscape, and Galeon, allows remote attackers to cause a denial of servicCVE-2005-2414 · Other software · Xpcom · reported by MITRELow 2.6
Race condition in the xpcom library, as used by web browsers such as Firefox, Mozilla, Netscape, and Galeon, allows remote attackers to cause a denial of service (application crash) via a large HTML file that loads a DOM call from within nested DIV tags, which causes part of the currently rendering page and referenced objects to be deleted.
- Product
- Xpcom
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordmarc.infosecuritytracker.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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