Vulnerability in WatchGuard Fireware OS

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund27 Oct 2026WID-SEC-2026-4209

  WatchGuard Fireware OS: Multiple vulnerabilities Translated from German

  CVE-2026-113881CVE-2026-103593CVE-2026-93434+15 more CVEs

[ References ]References

• psirt.watchguard.com/CVE-2026-90464