Overall the web-site technically looks great, however the login form is using $_GET method. This should not be used there, since sensitive data is now posted into the URL.
Lol. It's a scam so why even bother about the security of the website? Why do you even care about it?
CloudScam mining fixed rates ??

Fixed that for you. Gtfo this forum, please.
So you're the big cool admin guy there huh??

Fixed that for you. Gtfo this forum, please.
You're welcome for help.
BTW, I can't see it fixed:

No. I am absolutely not the admin of this site. I am only warning people for guys like you, which are offering ludicrous rates of interests. HYIP/Ponzi scams.
You're completely missing the point. Security on a HYIP/Ponzi site? For real?