Mozilla Firefox vulnerabilities

CVE-2009-3375 [MEDIUM] CWE-264 CVE-2009-3375: content/html/document/src/nsHTMLDocument.cpp in Mozilla Firefox 3.0.x before 3.0.15 and 3.5.x before content/html/document/src/nsHTMLDocument.cpp in Mozilla Firefox 3.0.x before 3.0.15 and 3.5.x before 3.5.4 allows user-assisted remote attackers to bypass the Same Origin Policy and read an arbitrary content selection via the document.getSelection function.

CVE-2021-38508 [MEDIUM] CWE-1021 CVE-2021-38508: By displaying a form validity message in the correct location at the same time as a permission promp By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could have obscured the prompt, resulting in the user potentially being tricked into granting the permission. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVE-2010-3774 [MEDIUM] CWE-20 CVE-2010-3774: The NS_SecurityCompareURIs function in netwerk/base/public/nsNetUtil.h in Mozilla Firefox before 3.5 The NS_SecurityCompareURIs function in netwerk/base/public/nsNetUtil.h in Mozilla Firefox before 3.5.16 and 3.6.x before 3.6.13, and SeaMonkey before 2.0.11, does not properly handle (1) about:neterror and (2) about:certerror pages, which allows remote attackers to spoof the location bar via a crafted web site.

CVE-2018-12399 [MEDIUM] CWE-287 CVE-2018-12399: When a new protocol handler is registered, the API accepts a title argument which can be used to mis When a new protocol handler is registered, the API accepts a title argument which can be used to mislead users about which domain is registering the new protocol. This may result in the user approving a protocol handler that they otherwise would not have. This vulnerability affects Firefox < 63.

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-2020-35111 [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-2016-2820 [MEDIUM] CWE-284 CVE-2016-2820: The Firefox Health Reports (aka FHR or about:healthreport) feature in Mozilla Firefox before 46.0 do The Firefox Health Reports (aka FHR or about:healthreport) feature in Mozilla Firefox before 46.0 does not properly restrict the origin of events, which makes it easier for remote attackers to modify sharing preferences by leveraging access to the remote-report IFRAME element.

CVE-2010-0172 [MEDIUM] CVE-2010-0172: toolkit/components/passwordmgr/src/nsLoginManagerPrompter.js in the asynchronous Authorization Promp toolkit/components/passwordmgr/src/nsLoginManagerPrompter.js in the asynchronous Authorization Prompt implementation in Mozilla Firefox 3.6 before 3.6.2 does not properly handle concurrent authorization requests from multiple web sites, which might allow remote web servers to spoof an authorization dialog and capture credentials by demanding HTTP authenticati

CVE-2008-2810 [MEDIUM] CWE-264 CVE-2008-2810: Mozilla Firefox before 2.0.0.15 and SeaMonkey before 1.1.10 do not properly identify the context of Mozilla Firefox before 2.0.0.15 and SeaMonkey before 1.1.10 do not properly identify the context of Windows shortcut files, which allows user-assisted remote attackers to bypass the Same Origin Policy via a crafted web site for which the user has previously saved a shortcut.

CVE-2015-0799 [MEDIUM] CWE-20 CVE-2015-0799: The HTTP Alternative Services feature in Mozilla Firefox before 37.0.1 allows man-in-the-middle atta The HTTP Alternative Services feature in Mozilla Firefox before 37.0.1 allows man-in-the-middle attackers to bypass an intended X.509 certificate-verification step for an SSL server by specifying that server in the uri-host field of an Alt-Svc HTTP/2 response header.

CVE-2023-5725 [MEDIUM] CVE-2023-5725: A malicious installed WebExtension could open arbitrary URLs, which under the right circumstance cou A malicious installed WebExtension could open arbitrary URLs, which under the right circumstance could be leveraged to collect sensitive user data. This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

CVE-2026-10702 [MEDIUM] CWE-843 CVE-2026-10702: JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 151.0.3.

CVE-2012-3974 [MEDIUM] CWE-399 CVE-2012-3974: Untrusted search path vulnerability in the installer in Mozilla Firefox before 15.0, Firefox ESR 10. Untrusted search path vulnerability in the installer 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 on Windows allows local users to gain privileges via a Trojan horse executable file in a root directory.

CVE-2024-5690 [MEDIUM] CWE-203 CVE-2024-5690: By monitoring the time certain operations take, an attacker could have guessed which external protoc By monitoring the time certain operations take, an attacker could have guessed which external protocol handlers were functional on a user's system. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.

CVE-2020-26954 [MEDIUM] CVE-2020-26954: When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from arbitrary file paths and allowed declaring webapp manifests for other origins. This could be used to gain fullscreen access for UI spoofing and could also lead to cross-origin attacks on targeted websites. *Note: This issue only affected Firefox for Andro

CVE-2024-11692 [MEDIUM] CWE-290 CVE-2024-11692: An attacker could cause a select dropdown to be shown over another tab; this could have led to user An attacker could cause a select dropdown to be shown over another tab; this could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.

CVE-2024-0748 [MEDIUM] CVE-2024-0748: A compromised content process could have updated the document URI. This could have allowed an attack A compromised content process could have updated the document URI. This could have allowed an attacker to set an arbitrary URI in the address bar or history. This vulnerability affects Firefox < 122.

CVE-2026-100783 [MEDIUM] CWE-457 CVE-2026-100783: Uninitialized memory in the Audio/Video component. This vulnerability was fixed in Firefox ESR 153.4 Uninitialized memory in the Audio/Video 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-2006-6585 [MEDIUM] CVE-2006-6585: The Extensions manager in Mozilla Firefox 2.0 does not properly populate the list of local extension The Extensions manager in Mozilla Firefox 2.0 does not properly populate the list of local extensions, which allows attackers to construct an extension that hides itself by finding its name in the list and then calling RemoveElement, as demonstrated by the FFsniFF extension. NOTE: it was later reported that 3.0 is also affected.

CVE-2006-1738 [MEDIUM] CVE-2006-1738: Unspecified vulnerability in Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Unspecified vulnerability in Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 allows remote attackers to cause a denial of service (crash) by changing the (1) -moz-grid and (2) -moz-grid-group display styles.