source: https://www.securityfocus.com/bid/16176/info

Venom Board is prone to multiple SQL injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input before using it in an SQL query.

Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation. 

http://www.example.com/venomboard/forum/post.php3?topic_id=999%20union%20select%201,2,3,4,5,6,7/*