Path traversal in Fireware OS - CVE-2026-3987
Published: April 2, 2026
Vulnerability identifier: #VU124818
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-3987
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: WatchGuard
Affected software:
Fireware OS
Fireware OS
Detailed vulnerability description
The vulnerability allows a remote user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in Fireware Web UI. A remote administrator can send a specially crafted HTTP request and upload arbitrary files on the system, leading to arbitrary code execution.
How to mitigate CVE-2026-3987
Install updates from vendor's website.