CVE-2026-3343

WatchGuard Firebox Reflected Cross-Site-Scripting (XSS) Vulnerability in Fireware Web UI

State: Published
Severity: 5.1 Medium
Published: Mar 3, 2026
Updated: Aug 10, 2026
Reserved: Feb 27, 2026

Description

A reflected cross-site scripting (XSS) vulnerability in the Fireware OS Web UI enabled execution of malicious JavaScript in the context of an authenticated management user's browser when they click on a specially crafted link.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	WatchGuard

Weaknesses

CWE-79

Affected Products

Product	Versions
Fireware OSWatchGuard	2025.1 to before 2026.1.2Affected 12.7 to before 12.11.8Affected

References

https://psirt.watchguard.com/CVE-2026-3343vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00004

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