Mozilla Firefox vulnerabilities

CVE-2005-0587 [MEDIUM] CWE-59 CVE-2005-0587: Firefox before 1.0.1 and Mozilla before 1.7.6 allows remote malicious web sites to overwrite arbitra Firefox before 1.0.1 and Mozilla before 1.7.6 allows remote malicious web sites to overwrite arbitrary files by tricking the user into downloading a .LNK (link) file twice, which overwrites the file that was referenced in the first .LNK file.

CVE-2019-11749 [MEDIUM] CVE-2019-11749: A vulnerability exists in WebRTC where malicious web content can use probing techniques on the getUs A vulnerability exists in WebRTC where malicious web content can use probing techniques on the getUserMedia API using constraints to reveal device properties of cameras on the system without triggering a user prompt or notification. This allows for the potential fingerprinting of users. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

CVE-2013-1712 [MEDIUM] CVE-2013-1712: Multiple untrusted search path vulnerabilities in updater.exe in Mozilla Updater in Mozilla Firefox Multiple untrusted search path vulnerabilities in updater.exe 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 on Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012 allow local users to gain privileges via a Trojan horse DLL in (1) the update

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-2012-4206 [MEDIUM] CVE-2012-4206: Untrusted search path vulnerability in the installer in Mozilla Firefox before 17.0 and Firefox ESR Untrusted search path vulnerability in the installer in Mozilla Firefox before 17.0 and Firefox ESR 10.x before 10.0.11 on Windows allows local users to gain privileges via a Trojan horse DLL in the default downloads directory.

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-2022-26383 [MEDIUM] CWE-451 CVE-2022-26383: When resizing a popup after requesting fullscreen access, the popup would not display the fullscreen When resizing a popup after requesting fullscreen access, the popup would not display the fullscreen notification. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.

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-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-2023-6868 [MEDIUM] CVE-2023-6868: In some instances, the user-agent would allow push requests which lacked a valid VAPID even though t In some instances, the user-agent would allow push requests which lacked a valid VAPID even though the push manager subscription defined one. This could allow empty messages to be sent from unauthorized parties. *This bug only affects Firefox on Android.* This vulnerability affects Firefox < 121.

CVE-2024-4767 [MEDIUM] CWE-459 CVE-2024-4767: If the `browser.privatebrowsing.autostart` preference is enabled, IndexedDB files were not properly If the `browser.privatebrowsing.autostart` preference is enabled, IndexedDB files were not properly deleted when the window was closed. This preference is disabled by default in Firefox. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

CVE-2005-4685 [MEDIUM] CVE-2005-4685: Firefox and Mozilla can associate a cookie with multiple domains when the DNS resolver has a non-roo Firefox and Mozilla can associate a cookie with multiple domains when the DNS resolver has a non-root domain in its search list, which allows remote attackers to trick a user into accepting a cookie for a hostname formed via search-list expansion of the hostname entered by the user, or steal a cookie for an expanded hostname, as demonstrated by an attacker wh

CVE-2022-38474 [MEDIUM] CWE-668 CVE-2022-38474: A website that had permission to access the microphone could record audio without the audio notifica A website that had permission to access the microphone could record audio without the audio notification being shown. This bug does not allow the attacker to bypass the permission prompt - it only affects the notification shown once permission has been granted.*This bug only affects Firefox for Android. Other operating systems are unaffected.*. This

CVE-2026-74971 [MEDIUM] CWE-200 CVE-2026-74971: Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixe Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVE-2026-74972 [MEDIUM] CWE-200 CVE-2026-74972: Information disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Fir Information disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVE-2025-6425 [MEDIUM] CWE-200 CVE-2025-6425: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent U 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 was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVE-2025-6434 [MEDIUM] CWE-1021 CVE-2025-6434: The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked a The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked an anti-clickjacking delay, potentially allowing an attacker to trick a user into granting an exception and loading a webpage over HTTP. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

CVE-2026-100766 [MEDIUM] CWE-200 CVE-2026-100766: Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVE-2026-100806 [MEDIUM] CWE-457 CVE-2026-100806: Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox ESR Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.