CVE-2026-3987

Analyzed Analyzed - Analysis Complete

Path Traversal in WatchGuard Fireware OS Enables Remote Code Execution

Publication date: 2026-04-01

Last updated on: 2026-08-14

Assigner: WatchGuard Technologies, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-01

Last Modified

2026-08-14

Generated

2026-08-30

AI Q&A

2026-04-02

EPSS Evaluated

2026-08-28

NVD

CVE-2026-3987

EUVD

EUVD-2026-18090

Affected Vendors & Products

Vendor	Product	Version / Range
watchguard	fireware	From 2025.1 (inc) to 2026.2 (exc)
watchguard	fireware	From 12.6.1 (inc) to 12.12 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Executive Summary

This vulnerability is a path traversal issue in the Fireware OS Web UI on WatchGuard Firebox systems. It allows a privileged authenticated remote attacker to execute arbitrary code with elevated system process privileges.

The affected versions include Fireware OS 12.6.1 up to and including 12.11.8, and 2025.1 up to and including 2026.1.2.

Impact Analysis

An attacker who successfully exploits this vulnerability can execute arbitrary code with elevated system privileges on the affected WatchGuard Firebox system.

This could lead to full system compromise.
It may allow the attacker to bypass security controls.
It could result in unauthorized access to sensitive data or disruption of network security functions.

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