---
id: CVE-2026-3987
title: >-
  A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox
  systems may allow a privileged authenticated remote attacker to execute
  arbitrary code in the context of an elevated system process.
summary: >-
  A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox
  systems may allow a privileged authenticated remote attacker to execute
  arbitrary code in the context of an elevated system process.
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: watchguard
product: fireware
affected:
  - 'fireware >= 2025.1, < 2026.2'
  - 'fireware >= 12.6.1, < 12.12'
patched:
  - fireware 12.12
published: '2026-04-01'
updated: '2026-08-14'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3987'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-3987'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
  - url: 'https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
epss: 0.00679
epssPercentile: 0.50961
ingestedAt: '2026-08-14T14:18:32.578Z'
---

## Overview

A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.

## Affected

- `fireware >= 2025.1, < 2026.2`
- `fireware >= 12.6.1, < 12.12`

## Remediation

Upgrade past the affected range:

- `fireware 12.12`