Unrestricted file upload in WooCommerce Checkout Manager

Published: 2019-04-26
Risk High
Patch available NO
Number of vulnerabilities 1
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
WooCommerce Checkout Manager
Web applications / Modules and components for CMS

Vendor Visser Labs

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Arbitrary file upload

EUVDB-ID: #VU18353

Risk: High

CVSSv3.1: 9.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]


CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No


The vulnerability allows a remote attacker to compromise vulnerable application.

The vulnerability exists due to missing restrictions when uploading PHP files via the "/wp-admin/admin-ajax.php" URL, when action is set to "wccs_upload_file_func" and valid "order_id" identifier is set. A remote non-authenticated attacker can upload and execute arbitrary PHP file on the server.

Exploitation example:

<form action="http://[host]/wp-admin/admin-ajax.php?action=wccs_upload_file_func&order_id=[order ID]&name=test" method="POST" enctype="multipart/form-data">
<input type="file" name="test[1]" />
<input type="submit" value="Submit" />


Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

WooCommerce Checkout Manager: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.5.1, 3.5.2, 3.5.3, 3.5.4, 3.5.5, 3.5.6, 3.5.7, 3.5.8, 3.5.9, 3.5.81, 3.6, 3.6.1, 3.6.2, 3.6.3, 3.6.4, 3.6.5, 3.6.6, 3.6.7, 3.6.8, 3.6.9, 4.0, 4.1.3,, 4.1.4, 4.1.7, 4.2, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.2.6

CPE2.3 External links


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.