CVE-2026-3987

WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI

State: Published
Severity: 8.6 High
Published: Apr 1, 2026
Updated: Aug 10, 2026
Reserved: Mar 11, 2026

Description

A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.

Scores

CVSS	Score	Vector	Source
4.0	8.6 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	WatchGuard

Weaknesses

CWE-22

Affected Products

Product	Versions
Fireware OSWatchGuard	2025.1 to before 2026.2Affected 12.6.1 to before 12.12Affected

References

https://psirt.watchguard.com/CVE-2026-3987vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009vendor-advisory

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