CVE-2026-58394 Details
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.
A stored cross-site scripting vulnerability has been identified in OPNsense, a FreeBSD-based firewall and routing platform, prior to version 26.1.11. The issue arises in the 'SSL Certificate' selector within the 'System -> Settings -> Administration' page. The vulnerability allows a user with the 'page-system-certmanager' privilege to inject HTML metacharacters into the certificate description, which are then executed when another user accesses the Administration settings. This exploitation is possible because the certificate descriptions are rendered without proper HTML escaping, leaving room for malicious scripts to run in the context of the user's session.
Users can update to OPNsense version 26.1.11 or 26.4.1p1, both of which include the necessary fix.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 15, 2026CISA-ADP
Assessed Oct 15, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/opnsense/core/commit/9d0a590e9c49f4374a5539929b366123f63bc9eb | [email protected] | Source CodeVendor |
| https://github.com/opnsense/core/commit/adcb02f8f68071e636bf9660b2cb8d0229f34674 | [email protected] | Source CodeVendor |
| https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j | [email protected] | AdvisoryExploitRemedyVendor |
| https://hackerask.com/posts/opnsense | [email protected] | BundleExploitRemedyTechnical Analysis |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OPNsense | <= 26.1.10 (semver) <= 26.4.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | CISA-ADP |
| Oct 15, 2026 | New CVE Received | [email protected] |