Mozilla Thunderbird vulnerabilities

CVE-2012-4208 [MEDIUM] CWE-200 CVE-2012-4208: The XrayWrapper implementation in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonke The XrayWrapper implementation in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 does not consider the compartment during property filtering, which allows remote attackers to bypass intended chrome-only restrictions on reading DOM object properties via a crafted web site.

CVE-2013-5595 [MEDIUM] CWE-119 CVE-2013-5595: The JavaScript engine in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x befor The JavaScript engine in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before 24.1, Thunderbird before 24.1, Thunderbird ESR 17.x before 17.0.10, and SeaMonkey before 2.22 does not properly allocate memory for unspecified functions, which allows remote attackers to conduct buffer overflow attacks via a crafted web page.

CVE-2018-12374 [MEDIUM] CWE-200 CVE-2018-12374: Plaintext of decrypted emails can leak through by user submitting an embedded form by pressing enter Plaintext of decrypted emails can leak through by user submitting an embedded form by pressing enter key within a text input field. This vulnerability affects Thunderbird < 52.9.

CVE-2013-5593 [MEDIUM] CWE-20 CVE-2013-5593: The SELECT element implementation in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thun The SELECT element implementation in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonkey before 2.22 does not properly restrict the nature or placement of HTML within a dropdown menu, which allows remote attackers to spoof the address bar or conduct clickjacking attacks via vectors that trigger navigation o

CVE-2012-5841 [MEDIUM] CWE-79 CVE-2012-5841: Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird E Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 implement cross-origin wrappers with a filtering behavior that does not properly restrict write actions, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted web site.

CVE-2012-3985 [MEDIUM] CWE-79 CVE-2012-3985: Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly impl Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly implement the HTML5 Same Origin Policy, which allows remote attackers to conduct cross-site scripting (XSS) attacks by leveraging initial-origin access after document.domain has been set.

CVE-2012-4195 [MEDIUM] CWE-79 CVE-2012-4195: The nsLocation::CheckURL function in Mozilla Firefox before 16.0.2, Firefox ESR 10.x before 10.0.10, The nsLocation::CheckURL function in Mozilla Firefox before 16.0.2, Firefox ESR 10.x before 10.0.10, Thunderbird before 16.0.2, Thunderbird ESR 10.x before 10.0.10, and SeaMonkey before 2.13.2 does not properly determine the calling document and principal in its return value, which makes it easier for remote attackers to conduct cross-site scripting (X

CVE-2026-15718 Mozilla Foundation Security Advisory 2026-72: CVE-2026-15718 Mozilla Foundation Security Advisory 2026-72 CVE: CVE-2026-15718 Product: Thunderbird Impact: high Fixed in: Thunderbird 140.13

CVE-2021-38506 [MEDIUM] CWE-1021 CVE-2021-38506: Through a series of navigations, Firefox could have entered fullscreen mode without notification or Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVE-2020-26953 [MEDIUM] CWE-1021 CVE-2020-26953: It was possible to cause the browser to enter fullscreen mode without displaying the security UI; th It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVE-2020-35111 [MEDIUM] CVE-2020-35111: When an extension with the proxy permission registered to receive <all_urls>, the proxy.onRequest ca When an extension with the proxy permission registered to receive , the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs, a user opening View Source could have inadvertently leaked their IP address. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

CVE-2021-43538 [MEDIUM] CWE-362 CVE-2021-43538: By misusing a race in our notification code, an attacker could have forcefully hidden the notificati By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

CVE-2013-1672 [MEDIUM] CWE-264 CVE-2013-1672: The Mozilla Maintenance Service in Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thun The Mozilla Maintenance Service in Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 on Windows allows local users to bypass integrity verification and gain privileges via vectors involving junctions.

CVE-2021-29956 [MEDIUM] CWE-312 CVE-2021-29956: OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were s OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were stored unencrypted on the user's local disk. The master password protection was inactive for those keys. Version 78.10.2 will restore the protection mechanism for newly imported keys, and will automatically protect keys that had been imported using aff

CVE-2023-5721 [MEDIUM] CWE-1021 CVE-2023-5721: It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an insufficient activation-delay. This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

CVE-2022-22743 [MEDIUM] CVE-2022-22743: When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

CVE-2024-0742 [MEDIUM] CVE-2024-0742: It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an incorrect timestamp used to prevent input after page load. This vulnerability affects Firefox < 122, Firefox ESR < 115.7, and Thunderbird < 115.7.

CVE-2022-34472 [MEDIUM] CWE-703 CVE-2022-34472: If there was a PAC URL set and the server that hosts the PAC was not reachable, OCSP requests would If there was a PAC URL set and the server that hosts the PAC was not reachable, OCSP requests would have been blocked, resulting in incorrect error pages being shown. This vulnerability affects Firefox < 102, Firefox ESR < 91.11, Thunderbird < 102, and Thunderbird < 91.11.

CVE-2023-4581 [MEDIUM] CVE-2023-4581: Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which all Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm. This vulnerability affects Firefox < 117, Firefox ESR < 102.15, Firefox ESR < 115.2, Thunderbird < 102.15, and Thunderbird < 115.2.

CVE-2025-6425 [MEDIUM] CVE-2025-6425: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted bet An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunder