WatchGuard Fireware OS Authentication Portal HTTP Request Smuggling Vulnerability Allowing Reflected Self-Cross-Site Scripting

Vulnerability

A vulnerability allowing HTTP request smuggling has been identified in the Authentication portal of WatchGuard Fireware OS. This issue allows remote attackers to bypass request parameter sanitation and execute a reflected self-Cross-Site Scripting (XSS) attack. The vulnerability affects Fireware OS versions 12.0 through 12.11.2.

Impact

Exploitation of this vulnerability could lead to request parameter sanitation being bypassed, allowing for reflected self-Cross-Site Scripting (XSS) attacks.

Remediation

Users can upgrade to WatchGuard Fireware OS 12.11.3 to address this vulnerability.

Added: Sep 15, 2025, 10:59 PM
Updated: Sep 15, 2025, 10:59 PM

Vulnerability Rating

Custom Algorithm
spread
4.5
impact
1.3
exploitability
6.0
remediation
7.7
relevance
0.5
threat
0.0
urgency
2.9
incentive
1.7

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