Mozilla Firefox and Thunderbird Mitigation Bypass Vulnerability

Vulnerability

A mitigation bypass vulnerability has been identified in the DOM: Security component, affecting Firefox versions prior to 148, Firefox ESR versions prior to 140.8, Thunderbird versions prior to 148, and Thunderbird ESR versions prior to 140.8. This vulnerability allows for the circumvention of security measures, potentially leading to unauthorized actions or access.

Impact

Exploitation of this vulnerability could allow for the bypassing of security mitigations, potentially leading to unauthorized actions or access.

Remediation

Users can upgrade to Firefox 148, Firefox ESR 140.8, Thunderbird 148, or Thunderbird ESR 140.8 to address this vulnerability.

Added: Feb 24, 2026, 2:42 PM
Updated: Feb 24, 2026, 10:44 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
1.3
exploitability
4.4
remediation
7.7
relevance
3.1
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.