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Mozilla Firefox Same-Origin Policy Bypass Vulnerability

Vulnerability

A same-origin policy bypass vulnerability has been identified in the Request Handling component of Mozilla Firefox. This issue affects Firefox versions prior to 146, as well as Firefox ESR versions prior to 115.31 and prior to 140.6.

Impact

Exploitation of this vulnerability allows for a same-origin policy bypass, which could lead to unauthorized access or manipulation of resources between different origins.

Remediation

Users can upgrade to Firefox 146 or Firefox ESR 115.31 or 140.6 to address this vulnerability.

Added: Dec 9, 2025, 8:35 PM
Updated: Dec 9, 2025, 8:35 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.8
exploitability
4.4
remediation
7.7
relevance
1.4
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.