CVE-2026-58394OPNsense: Stored XSS in Administration Settings via Certificate Description
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.2 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
opnsense core opnsense:core (from the name) | before 26.1.11 | CNA record |
References
- https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4jx-refsource-confirm
- https://github.com/opnsense/core/commit/9d0a590e9c49f4374a5539929b366123f63bc9ebx-refsource-misc
- https://github.com/opnsense/core/commit/adcb02f8f68071e636bf9660b2cb8d0229f34674x-refsource-misc
- https://hackerask.com/posts/opnsensex-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.