bdthemes SigmaForms Pro Plugin up to 1.4.5 on WordPress File Upload handle_form_submission allowed_file_types code injection

Summaryinfo

A vulnerability has been found in bdthemes SigmaForms Pro Plugin up to 1.4.5 and classified as critical. This vulnerability affects the function handle_form_submission of the component File Upload. This manipulation of the argument allowed_file_types causes code injection. This vulnerability is registered as CVE-2026-14494. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in bdthemes SigmaForms Pro Plugin up to 1.4.5. It has been declared as critical. Affected by this vulnerability is the function handle_form_submission of the component File Upload. The manipulation of the argument allowed_file_types with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Sigma Forms Pro plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.4.5 via the handle_form_submission function. This is due to the plugin dynamically granting the unfiltered_upload capability to all users during form submissions and bypassing MIME type validation when allowed_file_types is not configured. This makes it possible for unauthenticated attackers to execute code on the server. Several default pre-built templates including Job Application, Support Ticket, and Wholesale Application have file upload fields with no file type restrictions configured by design, making this vulnerability immediately exploitable upon installation.

It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-14494 since 07/02/2026. The exploitation appears to be easy. 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 08/29/2026). The attack technique deployed by this issue is T1059 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.

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Productinfo

Type

• WordPress Plugin

Vendor

• bdthemes

Name

• SigmaForms Pro Plugin

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5

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CPE 2.2info

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