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Mozilla Firefox and Thunderbird WebAuthn Component Spoofing Vulnerability

Vulnerability

A spoofing vulnerability has been identified in the WebAuthn component of Firefox for Android and Thunderbird. This issue affects Firefox and Thunderbird versions prior to 148.

Impact

Exploitation of this vulnerability could lead to spoofing, allowing an attacker to impersonate another user or entity.

Remediation

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

Added: Feb 24, 2026, 2:30 PM
Updated: Feb 24, 2026, 10:33 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.6
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.