source: https://www.securityfocus.com/bid/14052/info
  
UBB.Threads is prone to multiple SQL injection vulnerabilities because the application fails to properly sanitize user-supplied input before using it in SQL queries.
  
A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database.

http://www.example.com/ubbt/modifypost.phpCat=0&Username=foobar&Number=[SQL]&Board=UBB8&page=0&what=showflat&fpart=&vc=1&Approved=yes&convert=markup&Subject=Re%3A+Pruning+old+posts&Icon=book.gif&Body=yup&markedit=1&addsig=1&preview=1&peditdelete=Delete+this+post