CVE-2026-3343

EUVD-2026-9289
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.

This vulnerability affects Fireware OS 12.7 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.1 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
watchguardfireware
12.7 ≤
𝑥
< 12.11.8
watchguardfireware
2025.1 ≤
𝑥
< 2026.1.2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00004