FIREFOX · CVE-2026-124855 · Runtime
NO FIX YET · SEE WHAT TO DO
A flaw in the Navigation component of the DOM lets content escape the browser sandbox, according to the advisory text. The source says it was fixed in Firefox 160 and Firefox ESR 153.7, but does not say what an attacker gets beyond escaping the sandbox.
first public Nov 10, 2026 · 1 source
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firefox --version160 for Firefox and 153.7 for Firefox ESR160153.7Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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