Cross-site scripting in OPNsense - #VU139366
Published: July 26, 2026
Vulnerability identifier: #VU139366
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in the victim's browser within the WebGUI origin.
The vulnerability exists due to cross-site scripting in the trust revocation CRL description handling in /ui/trust/crl when rendering a stored CRL description into the CRL edit tab label. A remote user can store a crafted CRL description to execute arbitrary script in the victim's browser within the WebGUI origin.
User interaction is required to open the CRL edit row.
Affected software
OPNsense
Remediation
Install security update from vendor's website.
OPNsense - update to 26.7.1