Open Source Vulnerabilities

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During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash

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When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re-sent during a subsequent file download operation on the same domain, regardless of whether the origin...

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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

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Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker

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Incorrect bookkeeping of functions inlined during JIT compilation could have led to memory corruption and a potentially exploitable crash when handling out-of-memory errors

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In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS

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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

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Mozilla developers reported memory safety bugs present in Firefox 83

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parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization

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When a user typed a URL in the address bar or the search bar and quickly hit the enter key, a website could sometimes capture that event and then redirect the user before navigation occurred to the...

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In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition

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By attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain

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Side-channel information leakage in graphics in Google Chrome prior to 87

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When a malicious application installed on the user's device broadcast an Intent to Firefox for Android, arbitrary headers could have been specified, leading to attacks such as abusing ambient autho...

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Heap buffer overflow in Freetype in Google Chrome prior to 86

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lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must ensure that they are not attempting to use a dead actor they have a reference to

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Use after free in WebRTC in Google Chrome prior to 86

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Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78

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Mozilla developers reported memory safety bugs present in Firefox 84

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When sharing geolocation during an active WebRTC share, Firefox could have reset the webRTC sharing state in the user interface, leading to loss of control over the currently granted permission

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Mozilla developers reported memory safety bugs present in Firefox 83 and Firefox ESR 78

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Incorrect use of the '<RowCountChanged>' method could have led to a user-after-poison and a potentially exploitable crash

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If a user downloaded a file lacking an extension on Windows, and then "Open"-ed it from the downloads panel, if there was an executable file in the downloads directory with the same name but with a...

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When an extension with the proxy permission registered to receive <all_urls>, the proxy

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XSS bug in internal error pages could have led to various spoofing attacks, including other error pages and the address bar

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browser could have been confused into transferring a screen sharing state into another tab, which would leak unintended information

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Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine

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Navigations through the Android-specific `intent` URL scheme could have been misused to escape iframe sandbox

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When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type

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ambiguous file picker design could have confused users who intended to select and upload a single file into uploading a whole directory

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Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed

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browser could have been confused into transferring a pointer lock state into another tab, which could have lead to clickjacking attacks

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Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers

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Mozilla developers reported memory safety bugs present in Firefox 86

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Uninitialized Use in V8 in Google Chrome prior to 87

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malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL

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Use after free in WebRTC in Google Chrome prior to 88

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If an attacker is able to alter specific about:config values (for example malware running on the user's computer), the Devtools remote debugging feature could have been enabled in a way that was un...

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By causing a transition on a parent node by removing a CSS rule, an invalid property for a marker could have been applied, resulting in memory corruption and a potentially exploitable crash

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Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78

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Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash

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Mozilla developers reported memory safety bugs present in Firefox 85

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Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash

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Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious application to read sensitive data from application directories

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If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data

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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

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developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes

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When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the ifram...

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DOMParser API did not properly process '<noscript>' elements for escaping

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Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78