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Medium 6.5
When downloading an update for an addon, the downloaded addon update's version was not verified to match the version se…
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Medium 6.5
The <code>ms-msdt</code>, <code>search</code>, and <code>search-ms</code> protocols deliver content to Microsoft applic…
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Medium 4.3
If there was a PAC URL set and the server that hosts the PAC was not reachable, OCSP requests would have been blocked, …
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Medium 6.5
A malicious website that could create a popup could have resized the popup to overlay the address bar with its own cont…
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Medium 6.1
SVG <code><use></code> tags that referenced a same-origin document could have resulted in script execution if att…
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Medium 6.1
The HTML Sanitizer should have sanitized the <code>href</code> attribute of SVG <code><use></code> tags; however …
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Medium 6.1
Even when an iframe was sandboxed with <code>allow-top-navigation-by-user-activation</code>, if it received a redirect …
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Medium 6.5
By using a link with <code>rel="localization"</code> a use-after-free could have been triggered by destroying an object…
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Medium 5.4
Due to a layout change, iframe contents could have been rendered outside of its border. This could have led to user con…
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Medium 6.5
In unusual circumstances, selecting text could cause text selection caching to behave incorrectly, leading to a crash. …
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Medium 6.5
The sourceMapURL feature in devtools was missing security checks that would have allowed a webpage to attempt to includ…
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Medium 6.5
When generating the assembly code for <code>MLoadTypedArrayElementHole</code>, an incorrect AliasSet was used. In conju…
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Medium 6.5
<code>NSSToken</code> objects were referenced via direct points, and could have been accessed in an unsafe way on diffe…
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Medium 6.5
When reusing existing popups Firefox would have allowed them to cover the fullscreen notification UI, which could have …
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Medium 6.5
Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. Th…
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Medium 4.3
The Performance API did not properly hide the fact whether a request cross-origin resource has observed redirects. This…
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Medium 6.1
When closed or sent to the background, Firefox for Android would not properly record and persist HSTS settings.<br>*Not…
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Medium 6.1
An improper implementation of the new iframe sandbox keyword <code>allow-top-navigation-by-user-activation</code> could…
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Medium 6.1
Requests initiated through reader mode did not properly omit cookies with a SameSite attribute. This vulnerability affe…
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Medium 5.3
When visiting directory listings for `chrome://` URLs as source text, some parameters were reflected. This vulnerabilit…
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Medium 4.3
When loading a script with Subresource Integrity, attackers with an injection capability could trigger the reuse of pre…
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Medium 6.1
When using the Performance API, an attacker was able to notice subtle differences between PerformanceEntries and thus l…
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Medium 5.5
When opening a Windows shortcut from the local filesystem, an attacker could supply a remote path that would lead to un…
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Medium 6.5
When visiting a website with an overly long URL, the user interface would start to hang. Due to session restore, this c…
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Medium 6.5
When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resultin…
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Medium 4.3
If array shift operations are not used, the Garbage Collector may have become confused about valid objects. This vulner…
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Medium 6.5
An attacker could have injected CSS into stylesheets accessible via internal URIs, such as resource:, and in doing so b…
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Medium 6.5
An attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the…
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Medium 6.5
Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with other browsers. T…
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Medium 6.5
Remote Agent, used in WebDriver, did not validate the Host or Origin headers. This could have allowed websites to conne…
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Medium 6.5
After accepting an untrusted certificate, handling an empty pkcs7 sequence as part of the certificate data could have l…
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Medium 6.5
If a user installed an extension of a particular type, the extension could have auto-updated itself and while doing so,…
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Medium 6.5
Malicious websites could have tricked users into accepting launching a program to handle an external URL protocol. This…
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Medium 6.5
Securitypolicyviolation events could have leaked cross-origin information for frame-ancestors violations. This vulnerab…
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Medium 6.5
By generally accepting and passing resource handles across processes, a compromised content process might have confused…
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Medium 6.5
When importing resources using Web Workers, error messages would distinguish the difference between <code>application/j…
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Medium 6.5
Malicious websites could have confused Firefox into showing the wrong origin when asking to launch a program and handli…
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Medium 4.3
When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made th…
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Medium 6.5
When inserting text while in edit mode, some characters might have lead to out-of-bounds memory access causing a potent…
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Medium 4.3
Under certain circumstances, a JavaScript alert (or prompt) could have been shown while another website was displayed u…