The presence of SSL (HTTPS) has no effect on the quality of the code on the website - it is for transactional security only. MyBB is a well maintained forum software that recieves frequent security updates and bug fixes, and is not inherently vulnerable.
Hey Gibbon and Jojo - as Darkstar said, this isn't a modded server; we're semi-vanilla survival! You might have the wrong place, but feel free to drop in if you see someone online