Ninja Forms - Critical Flaw Allows Remote Code Execution
Active exploitation or massive impact — immediate action required
Basically, hackers can upload harmful files to websites using a flaw in a popular WordPress plugin.
A critical flaw in the Ninja Forms plugin for WordPress allows attackers to upload harmful files. With over 600,000 downloads, users must update immediately to avoid exploitation.
What Happened
A critical vulnerability has been discovered in the Ninja Forms File Uploads premium add-on for WordPress. This flaw allows attackers to upload arbitrary files without authentication, leading to potential remote code execution. Identified as CVE-2026-0740, this issue is currently being exploited in the wild.
Who's Affected
The Ninja Forms plugin, which has over 600,000 downloads, is widely used to create forms on WordPress sites. Specifically, the vulnerability affects versions up to 3.3.26 of the File Upload extension, which serves around 90,000 customers.
What Data Was Exposed
Due to the lack of validation on file types and extensions, attackers can upload harmful files, including PHP scripts. This opens the door for path traversal attacks, enabling unauthorized access to sensitive areas of the server. The potential consequences include the deployment of web shells and complete site takeovers.
What You Should Do
Users of the Ninja Forms File Upload add-on are strongly advised to upgrade to the latest version, 3.3.27, which includes a complete fix. Wordfence, a WordPress security company, has already blocked over 3,600 attacks related to this vulnerability in just 24 hours. If you haven't updated yet, do so immediately to protect your site from exploitation.
Discovery and Fixes
The vulnerability was discovered by security researcher Sélim Lanouar and reported through Wordfence’s bug bounty program on January 8. Following validation, Wordfence disclosed the vulnerability to the vendor and implemented temporary mitigations. The vendor released a partial fix on February 10, followed by a complete fix on March 19. Given the ongoing exploitation attempts, timely updates are crucial for all users.
🔍 How to Check If You're Affected
- 1.Check if your Ninja Forms File Uploads version is 3.3.26 or lower.
- 2.Review your server logs for any unauthorized file uploads.
- 3.Ensure your Wordfence firewall is updated and monitoring for suspicious activity.
🔒 Pro insight: The rapid exploitation of CVE-2026-0740 highlights the need for rigorous file validation in web applications.