---
id: CVE-2026-3343
title: >-
  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.
summary: >-
  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.
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: watchguard
product: fireware
affected:
  - 'fireware >= 12.7, < 12.11.8'
  - 'fireware >= 2025.1, < 2026.1.2'
patched:
  - fireware 2026.1.2
published: '2026-03-03'
updated: '2026-08-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3343'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-3343'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
  - url: 'https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00004'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
epss: 0.00206
epssPercentile: 0.10987
ingestedAt: '2026-08-11T16:47:04.012Z'
---

## Overview

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.

## Affected

- `fireware >= 12.7, < 12.11.8`
- `fireware >= 2025.1, < 2026.1.2`

## Remediation

Upgrade past the affected range:

- `fireware 2026.1.2`