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Mozilla Firefox Same-Origin Policy Bypass Vulnerability in Networking Component

Vulnerability

A same-origin policy bypass vulnerability has been identified in the Networking: HTTP component of Mozilla Firefox. This issue allows for cross-origin requests to be made inappropriately, potentially leading to unauthorized data access or manipulation. The vulnerability affects Firefox versions prior to 151 and Firefox ESR versions prior to 140.11.

Impact

Exploitation of this vulnerability allows for same-origin policy bypass, which could lead to cross-origin request forgery or unauthorized access to resources.

Remediation

Users can upgrade to Firefox 151 or Firefox ESR 140.11 to address this vulnerability.

Added: May 19, 2026, 2:48 PM
Updated: May 19, 2026, 2:48 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.6
exploitability
4.2
remediation
7.7
relevance
8.8
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.