CVE-2026-3987
Received Received - Intake
Path Traversal in WatchGuard Fireware OS Enables Remote Code Execution

Publication date: 2026-04-01

Last updated on: 2026-04-01

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.This issue affects Fireware OS 12.6.1 up to and including 12.11.8 and 2025.1 up to and including 2026.1.2.
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Meta Information
Published
2026-04-01
Last Modified
2026-04-01
Generated
2026-06-10
AI Q&A
2026-04-02
EPSS Evaluated
2026-06-09
NVD
CVE-2026-3987
EUVD
EUVD-2026-18090
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
watchguard fireware_os to 12.11.8 (inc)
watchguard fireware_os to 2026.1.2 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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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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