CVE-2026-90464#

Fireware OS Missing Command Validation allows Authenticated Arbitrary File Modification as Root

High 7.2 CVSS v4.0 › Published 2026-10-27Updated 2026-10-27

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, 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.

Product status #

Product	Affected	Not affected
Fireware OS
Default	>= 2025.1, < 2026.4, >= 12.0, < 12.12.4	>= 2026.4, >= 12.12.4
T15/T35	>= 12.0, < 12.5.22	>= 12.5.22

Weakness Type and Impact #

CWECWE-59Improper Link Resolution Before File Access ('Link Following')
CWECWE-73External Control of File Name or Path
CWECWE-732Incorrect Permission Assignment for Critical Resource
CAPECCAPEC-17Using Malicious Files
CAPECCAPEC-132Symlink Attack

Exploitation Status #

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

Solution #

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

References #

Credits #

WatchGuard AI Security Researchfinder