High [CVE-2026-90464] 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
This high-severity WatchGuard advisory covers CVE-2026-90464 affecting Fireware OS.
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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.
- Fireware OS 2025.1 before 2026.4
- Fireware OS 12.0 before 12.12.4
- Fireware OS 12.0 before 12.5.22
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
- 2026.4
- 12.12.4
- 12.5.22
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.4, 12.12.4, 12.5.22. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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- CVE-2026-103593Oct 27, 2026Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution
- CVE-2026-113881Oct 27, 2026Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged
- CVE-2026-93434Oct 27, 2026XPath injection vulnerability in WatchGuard Fireware OS's SSH authentication process
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