CVE-2026-100797

A use-after-free vulnerability in the WebRender component of Firefox allows for privilege escalation, potentially enabling attackers to execute arbitrary code within the context of the browser. Users of affected Firefox versions should prioritize updating to Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17 to mitigate this high-severity risk. Organizations relying on Firefox for critical operations should address this vulnerability promptly to protect against potential exploitation.