CVE-2026-13376CWE-79cross-site-scripting

CVE-2026-13376

Medium · published July 3, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
18.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00271 · 18.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-03T04:16Z
Affected products (3)
ProductVersionsFixed in
watchguard/fireware≥ 12.0, < 12.12.112.12.1
watchguard/fireware≥ 2025.1, < 2026.2.12026.2.1
watchguard/fireware≥ 12.5, ≤ 12.5.18—
References (2)
https://psirt.watchguard.com/CVE-2026-13376 · 5d1c2695-1a31-4499-88ae-e847036fd7e3https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00018 · 5d1c2695-1a31-4499-88ae-e847036fd7e3
EPSS history
Timeline
  • 02 JUL 23:05Z
    WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in spamBlocker Module
    cvelistv5