CVE-2026-90464

High

Description

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.

SeverityHigh

CVSS7.2

Exploit probability—

ProductFireware OS

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-59Improper link resolution CWE-73CWE-73 CWE-732CWE-732

How to fix

Update

WatchGuard Fireware OS2026.4, 12.12.4, 12.5.22 or later

Vendor advisories

psirt.watchguard.com/CVE-2026-90464

Affected products

Product	Affected versions	Fixed in
WatchGuard Fireware OS	2025.1 ≤ v < 2026.4, 12.0 ≤ v < 12.12.4, 12.0 ≤ v < 12.5.22	2026.4, 12.12.4, 12.5.22

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