Path traversal in OPNsense - #VU134541
Published: June 15, 2026
Vulnerability identifier: #VU134541
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Deciso
Affected software:
OPNsense
OPNsense
Detailed vulnerability description
The vulnerability allows a remote user to create root-owned symlinks outside the intended IPsec CA directory.
The vulnerability exists due to path traversal in Trust CA refid handling in IPsec CA file generation when processing attacker-controlled CA references during IPsec reconfiguration. A remote user can supply a crafted refid value to create root-owned symlinks outside the intended IPsec CA directory.
Exploitation requires access to Trust CA management and IPsec configuration, and the created symlink retains a fixed .crt suffix.
Remediation
Install security update from vendor's website.