FIREFOX · CVE-2026-124874 · Vendor
NO FIX YET · SEE WHAT TO DO
A flaw in Firefox's Networking HTTP component lets a web page bypass the same-origin policy, which normally keeps one site from reading data belonging to another. The sources do not say what data an attacker can reach or how reliably.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox release older than the fixed versions named in the advisory. The sources do not say which specific browsing conditions trigger the bypass, so unknown whether any setting limits exposure.
Not affected if already-updated-firefox
Who cares browser, firefox
160, 115.45 (ESR) and 153.7 (ESR), the versions named as fixed.160115.45153.7Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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