Improper Neutralization of Argument Delimiters in a Command in OPNsense - #VU129774
Published: May 5, 2026
Vulnerability identifier: #VU129774
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: N/A
CWE-ID: CWE-88
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 execute arbitrary code.
The vulnerability exists due to improper neutralization of argument delimiters in a command in the XMLRPC endpoint method opnsense.restore_config_section in src/etc/inc/auth.inc when processing user-supplied XMLRPC configuration data. A remote privileged user can send a specially crafted XMLRPC request to execute arbitrary code.
Exploitation requires access to the XMLRPC endpoint with the XMLRPC Library privilege, and the injected payload is triggered during a synchronization such as reloading all services.
Remediation
Install security update from vendor's website.