Is CVE-2026-58394 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-58394?

CVE-2026-58394 has a CVSS v3 severity of MEDIUM (5.2).

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CVE-2026-58394

Description

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.