FIREFOX · CVE-2026-124913 · Other
NO FIX YET · SEE WHAT TO DO
A site isolation issue in the Networking component of Firefox lets a malicious website reach data it should not see across site boundaries. The sources do not say what data an attacker can read or how easily it is triggered.
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 sites, since the flaw sits in the browser's networking code. Systems on Firefox 160 or later, or Firefox ESR 153.7 or later, are not affected. The sources do not say whether specific configurations or extensions change exposure.
Not affected if firefox-160-or-later, firefox-esr-153.7-or-later
Who cares browser, desktop, firefox
about:support in the address bar; versions below 160 on Firefox or 153.7 on Firefox ESR are affected.about:support (Application Basics shows the update channel).160153.7Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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