CVE-2026-3987: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in WatchGuard Fireware OS
CVE-2026-3987 is a path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems. It affects versions 12. 6. 1 through 12. 11. 8 and 2025. 1 through 2026. 1. 2. A privileged authenticated remote attacker could exploit this flaw to execute arbitrary code with elevated system process privileges.
AI Analysis
Technical Summary
This vulnerability (CWE-22) involves improper limitation of a pathname to a restricted directory in the Fireware OS Web UI, allowing a privileged authenticated remote attacker to perform path traversal. Successful exploitation enables arbitrary code execution in the context of an elevated system process. The affected product is WatchGuard Fireware OS versions 12.6.1 up to 12.11.8 and 2025.1 up to 2026.1.2. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker with privileged authentication can leverage this vulnerability to execute arbitrary code with elevated privileges on the affected Fireware OS systems. This could lead to full system compromise, impacting confidentiality, integrity, and availability of the device and potentially the network it protects. There are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict privileged access to the Fireware OS Web UI to trusted administrators only and monitor for unusual activity. Avoid exposing the management interface to untrusted networks.
CVE-2026-3987: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in WatchGuard Fireware OS
Description
CVE-2026-3987 is a path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems. It affects versions 12. 6. 1 through 12. 11. 8 and 2025. 1 through 2026. 1. 2. A privileged authenticated remote attacker could exploit this flaw to execute arbitrary code with elevated system process privileges.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-22) involves improper limitation of a pathname to a restricted directory in the Fireware OS Web UI, allowing a privileged authenticated remote attacker to perform path traversal. Successful exploitation enables arbitrary code execution in the context of an elevated system process. The affected product is WatchGuard Fireware OS versions 12.6.1 up to 12.11.8 and 2025.1 up to 2026.1.2. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker with privileged authentication can leverage this vulnerability to execute arbitrary code with elevated privileges on the affected Fireware OS systems. This could lead to full system compromise, impacting confidentiality, integrity, and availability of the device and potentially the network it protects. There are no reports of active exploitation in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict privileged access to the Fireware OS Web UI to trusted administrators only and monitor for unusual activity. Avoid exposing the management interface to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WatchGuard
- Date Reserved
- 2026-03-11T15:01:46.222Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69cd93efe6bfc5ba1d0036f2
Added to database: 4/1/2026, 9:53:51 PM
Last enriched: 4/9/2026, 10:51:48 PM
Last updated: 5/16/2026, 7:25:52 AM
Views: 88
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