What’s Vulnerable › Vulnerabilities

CVE-2025-1239: WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in Blocked Sites List

• Severity: medium (CVSS 4.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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 Blocked Sites list. 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 before 12.11.1; from 12.0 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

• https://psirt.watchguard.com/CVE-2025-1239
• https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00002

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