How to prevent this attack?

[aloneattack]

Phew,
limdis: don't fool me, lol
wan26: I missed you at the first step, that's a basic dox, isn't it?
But who know their nature work (the hackers, not me for sure, yes for sure)?
That seem to be fixed, and I'm also looking beyond that attack. Couldn't sure everything OK now, but the INPUT form might be validated now.

nei