CVE-2026-3987: CWE-22 in WatchGuard Fireware OS
A path traversal vulnerability exists in the Fireware OS Web UI on WatchGuard Firebox systems. This flaw may allow a privileged authenticated remote attacker to execute arbitrary code with elevated system process privileges. The vulnerability affects Fireware OS versions from 12.6.1 up to and including 12.11.8, and from 2025.1 up to and including 2026.1.2. The CVSS 3.1 base score is 7.2, indicating a high severity issue.
AI Analysis
Technical Summary
CVE-2026-3987 is a path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems. It allows a remote attacker with privileged authentication to execute arbitrary code in the context of an elevated system process. The vulnerability affects Fireware OS versions 12.6.1 through 12.11.8 and 2025.1 through 2026.1.2. The CVSS 3.1 vector indicates network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to arbitrary code execution with elevated privileges, potentially compromising system confidentiality, integrity, and availability. This could allow an attacker to take full control of the affected system processes.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links or vendor advisories are provided, users should monitor WatchGuard's official channels for updates and apply any official fixes once available. Until then, restrict access to the Fireware OS Web UI to trusted administrators only.
CVE-2026-3987: CWE-22 in WatchGuard Fireware OS
Description
A path traversal vulnerability exists in the Fireware OS Web UI on WatchGuard Firebox systems. This flaw may allow a privileged authenticated remote attacker to execute arbitrary code with elevated system process privileges. The vulnerability affects Fireware OS versions from 12.6.1 up to and including 12.11.8, and from 2025.1 up to and including 2026.1.2. The CVSS 3.1 base score is 7.2, indicating a high severity issue.
CVSS v4.0
Score 8.6high
Affected software
pkg:github/watchguard/fireware-osRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3987 is a path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems. It allows a remote attacker with privileged authentication to execute arbitrary code in the context of an elevated system process. The vulnerability affects Fireware OS versions 12.6.1 through 12.11.8 and 2025.1 through 2026.1.2. The CVSS 3.1 vector indicates network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to arbitrary code execution with elevated privileges, potentially compromising system confidentiality, integrity, and availability. This could allow an attacker to take full control of the affected system processes.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links or vendor advisories are provided, users should monitor WatchGuard's official channels for updates and apply any official fixes once available. Until then, restrict access to the Fireware OS Web UI to trusted administrators only.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-8r96-cj5h-474x
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-3987"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7f43ebbf8831d5395d632e
Added to database: 08/14/2026, 16:35:55 UTC
Last enriched: 08/14/2026, 16:42:57 UTC
Last updated: 08/16/2026, 12:41:09 UTC
Views: 4
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