CVE-2026-100819

A critical vulnerability in Firefox allows for a sandbox escape due to improper boundary conditions in the XPCOM component, potentially enabling attackers to execute arbitrary code outside of the browser's security confines. Users of affected Firefox versions should prioritize updating to the patched releases (Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17) to mitigate the risk of exploitation. Organizations relying on Firefox for secure browsing should take immediate action to ensure their systems are updated.