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OpenAdvisories
High · 7.2 CVE-2026-90464 EUVD-2026-111149GHSA-4766-2fhj-r6g2

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

Published Oct 27, 2026 · Updated Nov 4, 2026 · Assigned by WatchGuard

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.

Affected products

VendorProductAffectedFixed
WatchGuard Fireware OS 2025.1 – < 2026.4, 12.0 – < 12.12.4, 12.0 – < 12.5.22 2026.4

Advisories 1

References