Security issue on Teamcreation

Please change the way to create Teams. Dont use visual composer. I want forms like the way to create tournaments. I think the easiest way is the best way for the webpageusers. I like the tournamentcreation!

My friend is skilled on WP Code and other things like that. He test to find a security hole and he found one. Please contact me for more information.
Thats why im stopped working on my new websiteidea. The template looks very nice but i want to build a safe website. 🙂