---
id: CVE-2025-4804
title: >-
  Improper Neutralization of Input During Web Page Generation (XSS or
  'Cross-site Scripting') vulnerability in WatchGuard Fireware OS allows Stored
  XSS via the spamBlocker module
summary: >-
  Improper Neutralization of Input During Web Page Generation (XSS or
  'Cross-site Scripting') vulnerability in WatchGuard Fireware OS allows Stored
  XSS via the spamBlocker module. This vulnerability requires an authenticated
  administrator …
severity: none
cwe:
  - CWE-79
published: '2025-05-16'
updated: '2026-08-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-4804'
references:
  - url: 'https://psirt.watchguard.com/CVE-2025-4804'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
  - url: 'https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00006'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
epss: 0.00446
epssPercentile: 0.38157
ingestedAt: '2026-08-08T03:20:31.643Z'
---

## Overview

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS allows Stored XSS via the spamBlocker module. This vulnerability requires an authenticated administrator session to a locally managed Firebox.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.