CVE-2025-6947#

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration

Medium 4.8 CVSS v4.0 › Published 2025-09-15Updated 2026-08-07

Summary #

A stored cross-site scripting (XSS) vulnerability exists in the management interface of WatchGuard Firebox appliances via the SIP Proxy configuration. An authenticated remote attacker with administrator privileges could exploit this vulnerability to execute arbitrary JavaScript code in the Firebox management interface of another management user.

Product status #

Product	Affected	Not affected
Fireware OS
Default	>= 12.0, < 12.11.3	>= 12.11.3
T15/T35	>= 12.0, < 12.5.13	>= 12.5.13

Weakness Type and Impact #

CWECWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPECCAPEC-592Stored XSS

Exploitation Status #

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solution #

Fireware OS 12.11.3, Fireware OS 12.5.13

References #

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00012

Credits #

https://www.linkedin.com/in/simonepaganessi finder