CVE-2025-1071: WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in spamBlocker Module

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-14 · updated 2026-08-08
Weakness: CWE-79

Description

A stored cross-site scripting (XSS) vulnerability exists in the management interface of WatchGuard Firebox appliances via the spamBlocker module. 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.

Affected products

WatchGuard Fireware OS: from 12.0.0 before 12.11.1; from 12.5 before 12.5.13 — fixed in 12.11.1, 12.5.13

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 12.11.1, 12.5.13. Check the vendor advisory for mitigations.

References

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