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.
History

Sat, 17 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Opnsense
Opnsense core
Vendors & Products Opnsense
Opnsense core

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 15 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
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.
Title OPNsense: Stored XSS in Administration Settings via Certificate Description
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 5.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-15T15:20:15.232Z

Updated: 2026-10-15T18:36:57.734Z

Reserved: 2026-06-30T18:19:58.378Z

Link: CVE-2026-58394

cve-icon Vulnrichment

Updated: 2026-10-15T18:35:31.990Z

cve-icon NVD

Status : Deferred

Published: 2026-10-15T16:18:18.447

Modified: 2026-10-15T21:08:49.703

Link: CVE-2026-58394

cve-icon Redhat

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