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Mozilla Firefox and Thunderbird Fullscreen Spoofing Vulnerability

Vulnerability

A vulnerability exists in Firefox versions prior to 135 and Thunderbird versions prior to 135, allowing the z-order of browser windows to be manipulated. This manipulation can hide the fullscreen notification, potentially leading to a spoofing attack.

Impact

Exploitation of this vulnerability could result in a spoofing attack, where a user is misled or deceived by the content being presented to them.

Remediation

Users can upgrade to Firefox 135 or Thunderbird 135 to address this vulnerability.

Added: Jun 9, 2025, 7:46 PM
Updated: Jun 9, 2025, 7:46 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.6
exploitability
4.4
remediation
7.7
relevance
0.0
threat
0.0
urgency
2.9
incentive
0.8

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