FIREFOX · CVE-2026-124903 · Other
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in Firefox's IPC component allows a sandbox escape. An attacker who can run content in the browser could get past the sandbox restrictions meant to contain it.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox build older than the fixed versions is exposed, since the flaw is in the browser's own IPC code. Sources do not say whether a specific page or content type is needed to trigger it.
Not affected if fixed-version
Who cares desktop-browsers, firefox
about:support or the Help menu; compare against the fixed versions below.115.45 and 153.7.160115.45153.7Sandbox escape due to use-after-free in the IPC component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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