CVE-2026-16401

A privilege escalation vulnerability exists in the Data Loss Prevention component of Firefox, potentially allowing attackers to gain elevated permissions within the application. This high-severity flaw, rated 8.8 on the CVSS scale, should be prioritized by organizations using affected versions of Firefox and Thunderbird to mitigate the risk of unauthorized access and data breaches. Users are strongly advised to update to Firefox 153 or Thunderbird 153 to remediate this issue.