---
id: CVE-2026-90465
title: >-
  Fireware OS Missing Authentication in FireCluster Sync Allows Privilege
  Escalation
summary: >-
  A missing authentication vulnerability in the FireCluster Sync processing
  allows an attacker positioned on the cluster interconnect, such as a
  compromised cluster peer or an on-path network attacker, to invoke privileged
  firewall managem…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'
cvssSource: cna
cwe:
  - CWE-290
  - CWE-306
  - CWE-77
  - CWE-862
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: '2026-10-27T15:52:29.859Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-90465'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-90465'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.481Z'
---

## Overview

A missing authentication vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to invoke privileged firewall management actions as root by sending a specially crafted request.

## 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