CVE-2026-58394
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.
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.2 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N
- EPSS
- 0.24% probability · 15th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Source
- security-advisories@github.com
EPSS moved from 0.2% on 16 October 2026 to 0.2% on 26 October 2026.
References
- https://github.com/opnsense/core/commit/9d0a590e9c49f4374a5539929b366123f63bc9eb
- https://github.com/opnsense/core/commit/adcb02f8f68071e636bf9660b2cb8d0229f34674
- https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j
- https://hackerask.com/posts/opnsense
- https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.