---
id: CVE-2026-90464
title: >-
  Fireware OS Missing Command Validation allows Authenticated Arbitrary File
  Modification as Root
summary: >-
  An external control of file path vulnerability in a WatchGuard Fireware OS
  firewall diagnostic command allows a remote, authenticated attacker with at
  least read-only (Device Monitor) privileges and access to the management CLI
  to create…
severity: high
cvss: 7.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-59
  - CWE-73
  - CWE-732
vendor: WatchGuard
product: Fireware OS
affected:
  - fireware_os >= 2025.1 < 2026.4
  - fireware_os >= 12.0 < 12.12.4
  - fireware_os >= 12.0 < 12.5.22
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T15:52:28.267Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-90464'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-90464'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.480Z'
---

## Overview

An external control of file path vulnerability in a WatchGuard Fireware OS firewall diagnostic command allows a remote, authenticated attacker with at least read-only (Device Monitor) privileges and access to the management CLI to create, truncate, or overwrite arbitrary files and modify kernel parameters with root privileges by submitting a specially crafted command. Written content is limited to numeric values.

## Affected

- `fireware_os >= 2025.1 < 2026.4`
- `fireware_os >= 12.0 < 12.12.4`
- `fireware_os >= 12.0 < 12.5.22`

## Remediation

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22