Attackers Actively Exploiting Critical Vulnerability in Ninja Forms – File Upload Plugin 

SecurityVendor

On April 6th, 2026, we publicly disclosed a critical Arbitrary File Upload vulnerability in Ninja Forms – File Upload, a WordPress plugin with an estimated 50,000 active installations. This vulnerability can be leveraged by unauthenticated attackers to upload arbitrary files, including PHP backdoors, and achieve remote code execution.
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