Mozilla Thunderbird vulnerabilities

CVE-2026-2804 [MEDIUM] CWE-416 CVE-2026-2804: Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVE-2026-109741 [MEDIUM] Mozilla Foundation Security Advisory 2026-109: CVE-2026-109741 Mozilla Foundation Security Advisory 2026-109 CVE: CVE-2026-109741 Product: Thunderbird Impact: low Fixed in: Thunderbird 158

CVE-2026-92005 [MEDIUM] CWE-416 CVE-2026-92005: Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156 Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

CVE-2012-3984 [MEDIUM] CVE-2012-3984: Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly hand Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly handle navigation away from a web page that has a SELECT element's menu active, which allows remote attackers to spoof page content via vectors involving absolute positioning and scrolling.

CVE-2013-0747 [MEDIUM] CWE-20 CVE-2013-0747: The gPluginHandler.handleEvent function in the plugin handler in Mozilla Firefox before 18.0, Firefo The gPluginHandler.handleEvent function in the plugin handler in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not properly enforce the Same Origin Policy, which allows remote attackers to conduct clickjacking attacks via crafted JavaScript code

CVE-2009-1836 [MEDIUM] CWE-287 CVE-2009-1836: Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

CVE-2018-12373 [MEDIUM] CWE-200 CVE-2018-12373: dDecrypted S/MIME parts hidden with CSS or the plaintext HTML tag can leak plaintext when included i dDecrypted S/MIME parts hidden with CSS or the plaintext HTML tag can leak plaintext when included in a HTML reply/forward. This vulnerability affects Thunderbird < 52.9.

CVE-2021-29964 [HIGH] CWE-125 CVE-2021-29964: A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process inc A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.

CVE-2013-1706 [HIGH] CWE-119 CVE-2013-1706: Stack-based buffer overflow in maintenanceservice.exe in the Mozilla Maintenance Service in Mozilla Stack-based buffer overflow in maintenanceservice.exe in the Mozilla Maintenance Service in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird before 17.0.8, and Thunderbird ESR 17.x before 17.0.8 allows local users to gain privileges via a long pathname on the command line.

CVE-2013-1707 [HIGH] CWE-119 CVE-2013-1707: Stack-based buffer overflow in Mozilla Updater in Mozilla Firefox before 23.0, Firefox ESR 17.x befo Stack-based buffer overflow in Mozilla Updater in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird before 17.0.8, and Thunderbird ESR 17.x before 17.0.8 allows local users to gain privileges via a long pathname on the command line to the Mozilla Maintenance Service.

CVE-2026-118006 Mozilla Foundation Security Advisory 2026-121: CVE-2026-118006 Mozilla Foundation Security Advisory 2026-121 CVE: CVE-2026-118006 Product: Thunderbird Impact: low Fixed in: Thunderbird 159

CVE-2012-0460 [MEDIUM] CWE-264 CVE-2012-0460: Mozilla Firefox 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird 5.0 through 10.0, Thun Mozilla Firefox 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 do not properly restrict write access to the window.fullScreen object, which allows remote attackers to spoof the user interface via a crafted web page.

CVE-2020-15652 [MEDIUM] CWE-346 CVE-2020-15652: By observing the stack trace for JavaScript errors in web workers, it was possible to leak the resul By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.

CVE-2020-26961 [MEDIUM] CVE-2020-26961: When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the respo When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. This vulnerability affects Firefox < 83, Firefox ESR <

CVE-2020-16042 [MEDIUM] CVE-2020-16042: Uninitialized Use in V8 in Google Chrome prior to 87 Uninitialized Use in V8 in Google Chrome prior to 87.0.4280.88 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted HTML page.

CVE-2018-18499 [MEDIUM] CWE-346 CVE-2018-18499: A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page to cause a redirection to another site using performance.getEntries(). This is a same-origin policy violation and could allow for data theft. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.

CVE-2022-40960 [MEDIUM] CWE-416 CVE-2022-40960: Concurrent use of the URL parser with non-UTF-8 data was not thread-safe. This could lead to a use-a Concurrent use of the URL parser with non-UTF-8 data was not thread-safe. This could lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

CVE-2019-17016 [MEDIUM] CVE-2019-17016: When pasting a tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule When pasting a tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

CVE-2023-32206 [MEDIUM] CWE-125 CVE-2023-32206: An out-of-bound read could have led to a crash in the RLBox Expat driver. This vulnerability affects An out-of-bound read could have led to a crash in the RLBox Expat driver. This vulnerability affects Firefox < 113, Firefox ESR < 102.11, and Thunderbird < 102.11.

CVE-2020-15677 [MEDIUM] CWE-601 CVE-2020-15677: By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site d By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.