I found one article about block exploit attempts.

Can I use this in my .htaccess without damage of my forum?

########## Begin - Rewrite rules to block out some common exploits

#							  

# Block out any script trying to set a mosConfig value through the URL

RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR]

# Block out any script trying to base64_encode crap to send via URL

RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR]

# Block out any script that includes a <script> tag in URL

RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]

# Block out any script trying to set a PHP GLOBALS variable via URL

RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]

# Block out any script trying to modify a _REQUEST variable via URL

RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})

# Send all blocked request to homepage with 403 Forbidden error!

RewriteRule ^(.*)$ index.php [F,L]

# 

########## End - Rewrite rules to block out some common exploits

You can use it, but these methods of attack are relatively archaic and would have no effect on IPB anyways.

 

these methods of attack are relatively archaic and would have no effect on IPB anyways.

Thanks, that's it what I needed to know :)