A mysql query injection? That's a site security hole, and could potentially affect any coin. That makes little sense. If they were able to inject a query into the database, why not steal other coins?

Every altcoin looks very promising. Same old.

It can be a bit daunting at first, but as long as you are careful and ask a lot of questions. You'll be fine.

Don't be too trusting. Always try and read between the lines of what people are saying, and don't get caught up in the hype. Use your head and you won't have a single problem.