WPMU DEV Forminator Forms Plugin up to 1.56.1 on WordPress handle_file_upload unrestricted upload

Summaryinfo

A vulnerability described as critical has been identified in WPMU DEV Forminator Forms Plugin up to 1.56.1. Affected is the function handle_file_upload. Executing a manipulation can lead to unrestricted upload. This vulnerability is tracked as CVE-2026-15748. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in WPMU DEV Forminator Forms Plugin up to 1.56.1 and classified as critical. This vulnerability affects the function handle_file_upload. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-15748 since 07/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/18/2026). This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• WPMU DEV

Name

• Forminator Forms Plugin

Version

• 1.56.0
• 1.56.1

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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