inc2734 MW WP Form Plugin up to 5.1.0 on WordPress Path Validation file upload path traversal

Summaryinfo

A vulnerability was found in inc2734 MW WP Form Plugin up to 5.1.0 on WordPress. It has been rated as critical. The impacted element is the function generate_user_filepath/move_temp_file_to_upload_dir of the component Path Validation Handler. This manipulation of the argument file upload causes path traversal. This vulnerability appears as CVE-2026-4347. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in inc2734 MW WP Form Plugin up to 5.1.0 on WordPress. It has been declared as critical. Affected by this vulnerability is the function generate_user_filepath/move_temp_file_to_upload_dir of the component Path Validation Handler. The manipulation of the argument file upload with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The MW WP Form plugin for WordPress is vulnerable to arbitrary file moving due to insufficient file path validation via the 'generate_user_filepath' function and the 'move_temp_file_to_upload_dir' function in all versions up to, and including, 5.1.0. This makes it possible for unauthenticated attackers to move arbitrary files on the server, which can easily lead to remote code execution when the right file is moved (such as wp-config.php). The vulnerability is only exploitable if a file upload field is added to the form and the “Saving inquiry data in database” option is enabled.

The weakness was presented by ISMAILSHADOW. It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-4347 since 03/17/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/02/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18124). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• inc2734

Name

• MW WP Form Plugin

Version

• 5.0
• 5.1.0

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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