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CVE-2026-58394
OPNsense: Stored XSS in Administration Settings via Certificate Description
Medium5.2EPSS 0.24%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N |
| NVDNVD · Deferred | 3.1 | Medium5.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.2.
Weakness
Affected products
References (4)
- https://github.com/opnsense/core/security/advisories/GHSA-8pgr-x852-qx4j (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/opnsense/core/commit/9d0a590e9c49f4374a5539929b366123f63bc9eb (opens in a new tab)x_refsource_MISC
- https://github.com/opnsense/core/commit/adcb02f8f68071e636bf9660b2cb8d0229f34674 (opens in a new tab)x_refsource_MISC
- https://hackerask.com/posts/opnsense (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-58394)Record last updated .