Arbitrary File Upload Vulnerability in Ninja Forms File Uploads Plugin for WordPress

CVE-2026-0740

What is CVE-2026-0740?

CVE-2026-0740 is a critical vulnerability found in the Ninja Forms - File Uploads plugin for WordPress, specifically affecting all versions up to and including 3.3.26. This vulnerability stems from inadequate file type validation in the 'NF_FU_AJAX_Controllers_Uploads::handle_upload' function, enabling unauthenticated attackers to upload arbitrary files to the server hosting the affected website. The lack of sufficient validation could allow malicious actors to execute unauthorized scripts or code remotely, which poses significant risks to the integrity and confidentiality of the site's data and services. Organizations using this plugin are particularly vulnerable, as this flaw opens doors for potentially severe breaches, including data theft and server compromise, if exploited.

Potential impact of CVE-2026-0740

1. Remote Code Execution: The vulnerability allows attackers to upload and execute arbitrary files, potentially leading to full server control and the execution of malicious scripts that can disrupt services or compromise data.

2. Data Breaches: Successful exploitation can lead to unauthorized access to sensitive information stored on the website, resulting in potential data leaks that could affect users and organizational credibility.

3. Website Defacement and Malware Distribution: Attackers could use this vulnerability to deface websites or embed malware, which not only damages the reputation of the affected organization but also risks the safety of visitors who may become unintended targets of further attacks.

References