CVE-2026-86136#

Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant A

High 7.1 CVSS v4.0 › Published 2026-09-29Updated 2026-09-29

Summary #

A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.

Product status #

Product	Affected	Not affected
Fireware OS
Default	>= 2026.0, < 2026.3.2, >= 2025.0, < 2026.2.3, >= 12.0, < 12.12.3	>= 2026.3.2, >= 2026.2.3, >= 12.12.3
T15/T35	>= 12.0, < 12.5.21	>= 12.5.21

Weakness Type and Impact #

CWECWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWECWE-476NULL Pointer Dereference
CWECWE-862Missing Authorization
CAPECCAPEC-1Accessing Functionality Not Properly Constrained by ACLs
CAPECCAPEC-126Path Traversal

Exploitation Status #

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solution #

Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3, Fireware OS 12.5.21

References #

Credits #

WatchGuard AI Security Researchfinder