CVE-2026-74959

A mitigation bypass vulnerability in the Cache API component of Firefox could allow attackers to exploit cached data, potentially leading to unauthorized access or data leakage. Users of affected Firefox versions should prioritize updating to Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1 to mitigate this risk. Organizations relying on Firefox for secure browsing should assess their deployment and ensure timely updates to protect against potential exploitation.