CVE-2025-13937: WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in ConnectWise Technology Integration Configuration

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-04 · updated 2026-09-25
Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (ConnectWise Technology Integration module) allows Stored XSS.

Affected products

WatchGuard Fireware OS: from 2025.1 before 2025.1.3; from 12.0.0 before 12.11.5; from 12.5 before 12.5.14 — fixed in 12.11.5, 12.5.14, 2025.1.3

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 12.11.5, 12.5.14, 2025.1.3. Check the vendor advisory for mitigations.

References

https://psirt.watchguard.com/CVE-2025-13937
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00022

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