---
id: CVE-2026-86105
title: >-
  An improper authorization vulnerability in Fireware OS's Access Portal reverse
  proxy allows an authenticated, low-privileged Access Portal user to access
  other web applications they are not authorized for by sending a specially
  crafted r…
summary: >-
  An improper authorization vulnerability in Fireware OS's Access Portal reverse
  proxy allows an authenticated, low-privileged Access Portal user to access
  other web applications they are not authorized for by sending a specially
  crafted r…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-22
  - CWE-176
  - CWE-285
vendor: WatchGuard
product: Fireware OS
affected:
  - fireware_os >= 2026.3 < 2026.3.2
  - fireware_os >= 2025.0 < 2026.2.3
  - fireware_os >= 12.0 < 12.12.3
  - fireware_os >= 12.0 < 12.5.21
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T00:16:36.550'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86105'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-86105'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-29T23:52:50.547Z'
---

## Overview

An improper authorization vulnerability in Fireware OS's Access Portal reverse proxy allows an authenticated, low-privileged Access Portal user to access other web applications they are not authorized for by sending a specially crafted request for a different resource which they are authorized to access.

## Remediation

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