Path traversal in OPNsense - CVE-2026-58393
Published: July 3, 2026 / Updated: July 3, 2026
Vulnerability identifier: #VU136833
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-58393
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in generated CSO files. A remote user can send a specially crafted HTTP request and write arbitrary files on the system.
Affected software
OPNsense
How to mitigate CVE-2026-58393
Install updates from vendor's website.
OPNsense - addressed in versions 26.1.11, 26.4.1p1