Mozilla Thunderbird vulnerabilities

CVE-2018-5187 [CRITICAL] CWE-119 CVE-2018-5187: Memory safety bugs present in Firefox 60 and Firefox ESR 60. Some of these bugs showed evidence of m Memory safety bugs present in Firefox 60 and Firefox ESR 60. 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 < 60, Firefox ESR < 60.1, and Firefox < 61.

CVE-2017-7751 [CRITICAL] CWE-416 CVE-2017-7751: A use-after-free vulnerability with content viewer listeners that results in a potentially exploitab A use-after-free vulnerability with content viewer listeners that results in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

CVE-2013-0778 [CRITICAL] CWE-125 CVE-2013-0778: The ClusterIterator::NextCluster function in Mozilla Firefox before 19.0, Thunderbird before 17.0.3, The ClusterIterator::NextCluster function in Mozilla Firefox before 19.0, Thunderbird before 17.0.3, and SeaMonkey before 2.16 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read) via unspecified vectors.

CVE-2017-7779 [CRITICAL] CWE-119 CVE-2017-7779: Memory safety bugs were reported in Firefox 54, Firefox ESR 52.2, and Thunderbird 52.2. Some of thes Memory safety bugs were reported in Firefox 54, Firefox ESR 52.2, and Thunderbird 52.2. 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 < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVE-2007-3844 [MEDIUM] CVE-2007-3844: Mozilla Firefox 2.0.0.5, Thunderbird 2.0.0.5 and before 1.5.0.13, and SeaMonkey 1.1.3 allows remote Mozilla Firefox 2.0.0.5, Thunderbird 2.0.0.5 and before 1.5.0.13, and SeaMonkey 1.1.3 allows remote attackers to conduct cross-site scripting (XSS) attacks with chrome privileges via an addon that inserts a (1) javascript: or (2) data: link into an about:blank document loaded by chrome via (a) the window.open function or (b) a content.location assignment, aka

CVE-2017-7801 [CRITICAL] CWE-416 CVE-2017-7801: A use-after-free vulnerability can occur while re-computing layout for a "marquee" element during wi A use-after-free vulnerability can occur while re-computing layout for a "marquee" element during window resizing where the updated style object is freed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVE-2014-1508 [CRITICAL] CWE-125 CVE-2014-1508: The libxul.so!gfxContext::Polygon function in Mozilla Firefox before 28.0, Firefox ESR 24.x before 2 The libxul.so!gfxContext::Polygon function in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allows remote attackers to obtain sensitive information from process memory, cause a denial of service (out-of-bounds read and application crash), or possibly bypass the Same Origin Policy via ve

CVE-2015-2736 [CRITICAL] CWE-17 CVE-2015-2736: The nsZipArchive::BuildFileList function in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31. The nsZipArchive::BuildFileList function in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, and Thunderbird before 38.1 accesses unintended memory locations, which allows remote attackers to have an unspecified impact via a crafted ZIP archive.

CVE-2024-7525 [HIGH] CWE-276 CVE-2024-7525: It was possible for a web extension with minimal permissions to create a `StreamFilter` which could It was possible for a web extension with minimal permissions to create a `StreamFilter` which could be used to read and modify the response body of requests on any site. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

CVE-2017-7793 [CRITICAL] CWE-416 CVE-2017-7793: A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window a A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

CVE-2022-45414 [HIGH] CVE-2022-45414: If a Thunderbird user quoted from an HTML email, for example by replying to the email, and the email If a Thunderbird user quoted from an HTML email, for example by replying to the email, and the email contained either a VIDEO tag with the POSTER attribute or an OBJECT tag with a DATA attribute, a network request to the referenced remote URL was performed, regardless of a configuration to block remote content. An image loaded from the POSTER attribute was sh

CVE-2024-11700 [HIGH] CWE-1021 CVE-2024-11700: Malicious websites may have been able to perform user intent confirmation through tapjacking. This c Malicious websites may have been able to perform user intent confirmation through tapjacking. This could have led to users unknowingly approving the launch of external applications, potentially exposing them to underlying vulnerabilities. This vulnerability affects Firefox < 133 and Thunderbird < 133.

CVE-2025-3909 [HIGH] CWE-356 CVE-2025-3909: Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute J Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the file:/// context. By crafting a nested email attachment (message/rfc822) and setting its content type to application/pdf, Thunderbird may incorrectly render it as HTML when opened, allowing the embedded JavaScript to run without requiring

CVE-2018-5174 [HIGH] CVE-2018-5174: In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" f In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" flag associated with downloaded files and will not show any UI. Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed to be opened b

CVE-2025-9180 [HIGH] CWE-346 CVE-2025-9180: Same-origin policy bypass in the Graphics: Canvas2D component. This vulnerability was fixed in Firef Same-origin policy bypass in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

CVE-2020-6814 [CRITICAL] CWE-787 CVE-2020-6814: Mozilla developers reported memory safety bugs present in Firefox and Thunderbird 68.5. Some of thes Mozilla developers reported memory safety bugs present in Firefox and Thunderbird 68.5. 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 affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

CVE-2017-7753 [CRITICAL] CWE-125 CVE-2017-7753: An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, usi An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVE-2012-3980 [CRITICAL] CWE-94 CVE-2012-3980: The web console in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 1 The web console in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, and Thunderbird ESR 10.x before 10.0.7 allows user-assisted remote attackers to execute arbitrary JavaScript code with chrome privileges via a crafted web site that injects this code and triggers an eval operation.

CVE-2026-4693 [HIGH] CVE-2026-4693: Incorrect boundary conditions in the Audio/Video: Playback component Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

CVE-2026-4699 [HIGH] CVE-2026-4699: Incorrect boundary conditions in the Layout: Text and Fonts component Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.