CVE-2026-124931 · Runtime
NO FIX YET · SEE WHAT TO DO
A flaw in the Core and HTML DOM component of Firefox lets a web page bypass the same-origin policy that keeps sites from reading each other's data. An attacker who gets a victim to visit a malicious page could read or act on data from other sites the victim is logged into.
first public Nov 10, 2026 · 1 source
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Anyone running Firefox or Firefox ESR older than the fixed versions is exposed when browsing the web. Systems where Firefox is not installed, or runs a patched build, can skip it.
Not affected if patched-version
Who cares browsers, desktop, firefox
firefox --version on Linux or macOS.160 or later.153.7 or later.Same-origin policy bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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