CVE-2026-90464

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

State: Published
Severity: 7.2 High
Published: Oct 27, 2026
Updated: Oct 27, 2026
Reserved: Sep 11, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.2 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N	WatchGuard

Weaknesses

Affected Products

Product	Versions
Fireware OSWatchGuard	2025.1 to before 2026.4Affected 12.0 to before 12.12.4Affected
Fireware OSWatchGuard	12.0 to before 12.5.22Affected

References

https://psirt.watchguard.com/CVE-2026-90464vendor-advisory

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