Vulnerabilities

Mozilla developers Calixte Denizet, Kershaw Chang, Christian Holler, Jason Kratzer, Gabriele Svelto, Tyson Smith, Simon Giesecke, and Steve Fink reported memory safety bugs present in Firefox 95 and Firefox ESR 91.4.

Malicious websites could have confused Firefox into showing the wrong origin when asking to launch a program and handling an external URL protocol.

After accepting an untrusted certificate, handling an empty pkcs7 sequence as part of the certificate data could have lead to a crash.

A race condition could have allowed bypassing the fullscreen notification which could have lead to a fullscreen window spoof being unnoticed.<br>*This bug only affects Firefox for Windows.

Securitypolicyviolation events could have leaked cross-origin information for frame-ancestors violations.

The constructed curl command from the "Copy as curl" feature in DevTools was not properly escaped for PowerShell.

When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen mode.

When inserting text while in edit mode, some characters might have lead to out-of-bounds memory access causing a potentially exploitable crash.

When resizing a popup while requesting fullscreen access, the popup would have become unable to leave fullscreen mode.

Certain network request objects were freed too early when releasing a network request handle.

Malicious websites could have tricked users into accepting launching a program to handle an external URL protocol.

Applying a CSS filter effect could have accessed out of bounds memory.

Constructing audio sinks could have lead to a race condition when playing audio files and closing windows.

It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox.