It is tempting to look for "nulled" versions of premium software like Ninja Forms Pro to save a few dollars, but using cracked plugins is essentially like leaving the front door of your website wide open with a sign that says "Welcome."
Vulnerability Summary from Wordfence Intelligence. Ninja Forms - File Upload <= 3.3.26 - Unauthenticated Arbitrary File Upload. .. Nulled WordPress Plugins - Dangers and Downsides ninja forms pro nulled 13 upd
The Risks of Using Nulled Software
Why Choose the Official Version?