Volerion logoVolerion
Volerion logoVolerion

Mozilla Firefox and Thunderbird Mitigation Bypass Vulnerability in the Networking: Cache Component

Vulnerability

A vulnerability allowing for mitigation bypass has been identified in the Networking: Cache component, affecting multiple Mozilla products. This issue is present in 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.

Impact

Exploitation of this vulnerability leads to a bypass of existing mitigations, potentially allowing other vulnerabilities to be exploited or increasing their impact.

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, 2:38 PM
Updated: Feb 24, 2026, 10:38 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
1.9
exploitability
3.8
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.