Mozilla Thunderbird vulnerabilities

CVE-2026-6747 [HIGH] CWE-416 CVE-2026-6747: Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140 Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVE-2026-8960 [HIGH] CWE-290 CVE-2026-8960: Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151. Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVE-2026-6782 [HIGH] CWE-200 CVE-2026-6782: Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 150 a Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

CVE-2025-13012 [HIGH] CVE-2025-13012: Race condition in the Graphics component Race condition in the Graphics component. This vulnerability affects Firefox < 145, Firefox ESR < 140.5, Firefox ESR < 115.30, Thunderbird < 145, and Thunderbird < 140.5.

CVE-2026-16398 [HIGH] CWE-200 CVE-2026-16398: Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thun Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVE-2026-16399 [HIGH] CWE-346 CVE-2026-16399: Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 a Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVE-2026-74934 [HIGH] CWE-200 CVE-2026-74934: Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVE-2006-5747 [HIGH] CVE-2006-5747: Unspecified vulnerability in Mozilla Firefox before 1.5.0.8, Thunderbird before 1.5.0.8, and SeaMonk Unspecified vulnerability in Mozilla Firefox before 1.5.0.8, Thunderbird before 1.5.0.8, and SeaMonkey before 1.0.6 allows remote attackers to execute arbitrary code via the XML.prototype.hasOwnProperty JavaScript function.

CVE-2009-0773 [CRITICAL] CWE-399 CVE-2009-0773: The JavaScript engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1. The JavaScript engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via (1) a splice of an array that contains "some non-set elements," which causes jsarray.cpp to pass an incorrect argument to the ResizeSlots functio

CVE-2022-22759 [CRITICAL] CWE-693 CVE-2022-22759: If a document created a sandboxed iframe without <code>allow-scripts</code>, and subsequently append If a document created a sandboxed iframe without allow-scripts, and subsequently appended an element to the iframe's document that e.g. had a JavaScript event handler - the event handler would have run despite the iframe's sandbox. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

CVE-2025-1936 [HIGH] CWE-158 CVE-2025-1936: jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it wa jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content from the archive, but the fake extension after the null was used to determine the type of content. This could have been used to hide code in a web extension disguised as something else like an image. This vulnerabilit

CVE-2014-1547 [CRITICAL] CVE-2014-1547: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 31.0, Firefox E Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 31.0, Firefox ESR 24.x before 24.7, and Thunderbird before 24.7 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2025-5272 [HIGH] CWE-787 CVE-2025-5272: Memory safety bugs present in Firefox 138 and Thunderbird 138. Some of these bugs showed evidence of Memory safety bugs present in Firefox 138 and Thunderbird 138. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 139 and Thunderbird 139.

CVE-2026-12318 [HIGH] CWE-119 CVE-2026-12318: Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Fir Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVE-2011-2375 [CRITICAL] CVE-2011-2375: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 5.0 and Thunder Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 5.0 and Thunderbird through 3.1.11 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2018-5125 [HIGH] CWE-119 CVE-2018-5125: Memory safety bugs were reported in Firefox 58 and Firefox ESR 52.6. Some of these bugs showed evide Memory safety bugs were reported in Firefox 58 and Firefox ESR 52.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 52.7, Firefox ESR < 52.7, and Firefox < 59.

CVE-2011-2997 [CRITICAL] CVE-2011-2997: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 6, Thunderbird before Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 6, Thunderbird before 7.0, and SeaMonkey before 2.4 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2011-2985 [CRITICAL] CVE-2011-2985: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 4.x through 5, Thunder Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 4.x through 5, Thunderbird before 6, SeaMonkey 2.x before 2.3, and possibly other products allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2013-1718 [CRITICAL] CWE-119 CVE-2013-1718: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 24.0, Firefox E Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 24.0, Firefox ESR 17.x before 17.0.9, Thunderbird before 24.0, Thunderbird ESR 17.x before 17.0.9, and SeaMonkey before 2.21 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown

CVE-2013-5603 [CRITICAL] CVE-2013-5603: Use-after-free vulnerability in the nsContentUtils::ContentIsHostIncludingDescendantOf function in M Use-after-free vulnerability in the nsContentUtils::ContentIsHostIncludingDescendantOf function in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via vectors involving HTML document templates.