I tried some but they didn't work,

How can i know which ver. the forum is running? (it doesn't say so in the main page).

Anyhow, i'll appreciate if someone can direct me to some king of exploit/poc/sql injection

which does work.

Thanks.

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- I've found a lot of forums with in the buttom - but, try see "Help!" page, maybe there is something..

Well, it requires user+pass in order to enter any page in this forum.

Anyhow, does anyone know any good exploit for this?

try the Woltlab Burning Board 2 v. 1-4
to find out how it works

it is also whit the register.php

The latest remote access vulnerability has been:
http://secunia.com/advisories/10557/

This, however, only affects versions below 2.3.4.

The latest XSS vulnerabilities are:
http://secunia.com/advisories/11142/

These only affect versions below 3.0.0 RC4.

Unless you already have an account on the forum, you will not be able to exploit the XSS vulnerabilities. XSS exploits only get you access to other accounts anyway.