CVE-2026-58394CWE-79cross-site-scripting

CVE-2026-58394

Medium · published October 15, 2026

CVSS v3.1
5.2
EPSS
0%
Percentile
14.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.2 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00239 · 14.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-15T20:18Z
References (5)
https://github.com/opnsense/core/commit/9d0a590e9c49f4374a5539929b366123f63bc9eb · [email protected]https://github.com/opnsense/core/commit/adcb02f8f68071e636bf9660b2cb8d0229f34674 · [email protected]https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j · [email protected]https://hackerask.com/posts/opnsense · [email protected]https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 15 OCT 15:20Z
    OPNsense: Stored XSS in Administration Settings via Certificate Description
    cvelistv5
  • 15 OCT 15:20Z
    OPNsense: Stored XSS in Administration Settings via Certificate Description
    cvelistv5