source: https://www.securityfocus.com/bid/17224/info

MySQL Based Message Board is prone to an SQL-injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in an SQL query. 

A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database implementation.

http://www.example.com/cgi-bin/mb.cgi?action=showmessage&topicnumber=1&threadnumber=7
&category=Computer&topic=Linux&username=K-sPEcial