Mozilla Thunderbird vulnerabilities

CVE-2019-11744 [MEDIUM] CWE-79 CVE-2019-11744: Some HTML elements, such as <title> and <textarea>, can contain literal angle brackets w Some HTML elements, such as and , can contain literal angle brackets without treating them as markup. It is possible to pass a literal closing tag to .innerHTML on these elements, and subsequent content after that will be parsed as if it were outside the tag. This can lead to XSS if a site does not filter user input as strictly for these elements as

CVE-2006-0296 [MEDIUM] CVE-2006-0296: The XULDocument The XULDocument.persist function in Mozilla, Firefox before 1.5.0.1, and SeaMonkey before 1.0 does not validate the attribute name, which allows remote attackers to execute arbitrary Javascript by injecting RDF data into the user's localstore.rdf file.

CVE-2020-26956 [MEDIUM] CWE-79 CVE-2020-26956: In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVE-2012-3972 [MEDIUM] CWE-200 CVE-2012-3972: The format-number functionality in the XSLT implementation in Mozilla Firefox before 15.0, Firefox E The format-number functionality in the XSLT implementation in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 allows remote attackers to obtain sensitive information via unspecified vectors that trigger a heap-based buffer over-read.

CVE-2022-29912 [MEDIUM] CWE-601 CVE-2022-29912: Requests initiated through reader mode did not properly omit cookies with a SameSite attribute. This Requests initiated through reader mode did not properly omit cookies with a SameSite attribute. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

CVE-2017-5405 [MEDIUM] CWE-1187 CVE-2017-5405: Certain response codes in FTP connections can result in the use of uninitialized values for ports in Certain response codes in FTP connections can result in the use of uninitialized values for ports in FTP operations. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

CVE-2014-1552 [MEDIUM] CWE-264 CVE-2014-1552: Mozilla Firefox before 31.0 and Thunderbird before 31.0 do not properly implement the sandbox attrib Mozilla Firefox before 31.0 and Thunderbird before 31.0 do not properly implement the sandbox attribute of the IFRAME element, which allows remote attackers to bypass intended restrictions on same-origin content via a crafted web site in conjunction with a redirect.

CVE-2025-10536 [MEDIUM] CWE-200 CVE-2025-10536: Information disclosure in the Networking: Cache component. This vulnerability was fixed in Firefox 1 Information disclosure in the Networking: Cache component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

CVE-2017-5383 [MEDIUM] CWE-20 CVE-2017-5383: URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger pu URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger punycode display, allowing for domain name spoofing attacks in the location bar. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

CVE-2026-103500 [MEDIUM] CWE-787 CVE-2026-103500: An attacker could cause a heap buffer overflow by getting a user to open an email that is greater th An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

CVE-2025-11712 [MEDIUM] CWE-116 CVE-2025-11712: A malicious page could have used the type attribute of an OBJECT tag to override the default browser A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunder

CVE-2013-1737 [MEDIUM] CWE-264 CVE-2013-1737: Mozilla Firefox before 24.0, Firefox ESR 17.x before 17.0.9, Thunderbird before 24.0, Thunderbird ES 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 do not properly identify the "this" object during use of user-defined getter methods on DOM proxies, which might allow remote attackers to bypass intended access restrictions via vectors involving an expan

CVE-2015-7197 [MEDIUM] CVE-2015-7197: Mozilla Firefox before 42 Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 improperly control the ability of a web worker to create a WebSocket object, which allows remote attackers to bypass intended mixed-content restrictions via crafted JavaScript code.

CVE-2017-7848 [MEDIUM] CWE-74 CVE-2017-7848: RSS fields can inject new lines into the created email structure, modifying the message body. This v RSS fields can inject new lines into the created email structure, modifying the message body. This vulnerability affects Thunderbird < 52.5.2.

CVE-2017-7823 [MEDIUM] CWE-79 CVE-2017-7823: The content security policy (CSP) "sandbox" directive did not create a unique origin for the documen The content security policy (CSP) "sandbox" directive did not create a unique origin for the document, causing it to behave as if the "allow-same-origin" keyword were always specified. This could allow a Cross-Site Scripting (XSS) attack to be launched from unsafe content. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 5

CVE-2019-9801 [MEDIUM] CWE-20 CVE-2019-9801: Firefox will accept any registered Program ID as an external protocol handler and offer to launch th Firefox will accept any registered Program ID as an external protocol handler and offer to launch this local application when given a matching URL on Windows operating systems. This should only happen if the program has specifically registered itself as a "URL Handler" in the Windows registry. *Note: This issue only affects Windows operating systems. O

CVE-2016-5291 [MEDIUM] CWE-20 CVE-2016-5291: A same-origin policy bypass with local shortcut files to load arbitrary local content from disk. Thi A same-origin policy bypass with local shortcut files to load arbitrary local content from disk. This vulnerability affects Thunderbird < 45.5, Firefox ESR < 45.5, and Firefox < 50.

CVE-2023-29479 [MEDIUM] CVE-2023-29479: Ribose RNP before 0 Ribose RNP before 0.16.3 may hang when the input is malformed.

CVE-2020-12392 [MEDIUM] CWE-22 CVE-2020-12392: The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in the disclosure of local files. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and

CVE-2022-28286 [MEDIUM] CWE-1021 CVE-2022-28286: Due to a layout change, iframe contents could have been rendered outside of its border. This could h Due to a layout change, iframe contents could have been rendered outside of its border. This could have led to user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.