CVE-2026-58394

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, src/www/system advanced admin.php reads certificate records into $a cert but omits that array from legacy html escape form data() before rendering each certificate descr value in the SSL Certificate selector. The certificate description accepts HTML metacharacters, allowing a user with the page-system-certmanager privilege to store markup that executes when another user opens System Settings Administration. This issue is fixed in version 26.1.11.