Cross-site scripting in Fireware OS - CVE-2026-13374

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Main Vulnerability Database Vulnerabilities #VU136886

Cross-site scripting in Fireware OS - CVE-2026-13374

Published: July 3, 2026


Vulnerability identifier: #VU136886
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-13374
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: WatchGuard
Affected software:
Fireware OS

Detailed vulnerability description

The vulnerability allows a remote user to perform stored cross-site scripting.

The vulnerability exists due to cross-site scripting in the ConnectWise Technology Integration module when generating web pages with user-supplied input. A remote privileged user can inject a crafted payload to perform stored cross-site scripting.

This issue is described as an additional unmitigated attack path for CVE-2025-13937.


How to mitigate CVE-2026-13374

Install security update from vendor's website.

Sources