CVE-2026-13376

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.

Score

CVSS 4.0 4.8 Medium

Status

Modified - 5d1c2695-1a31-4499-88ae-e847036fd7e3

Published

2026-07-02

Last modified

2026-10-25

Weaknesses

CWE-79

Affected products

• Fireware (Watchguard)
• Fireware Os (Watchguard)

References

• https://psirt.watchguard.com/CVE-2026-13376
• https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00018