PT-2026-55332 · Watchguard · Fireware Os

Simone Paganessi · Published 2026-07-02 · Updated 2026-07-03 · CVE-2026-13376

NVD

CVSS v4.0

4.8

Medium

Base vector

AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS spamBlocker module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-1071.

This issue affects Fireware OS 12.0 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-13376

Affected Products

Fireware Os

References · 2

• https://watchguard.com/wgrd-psirt/advisory/wgsa-2026-00018 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-13376 · Security Note