Blog System 1.2 - 'index.php?cat' SQL Injection

source: https://www.securityfocus.com/bid/15719/info

Blog System 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/index.php?mode=home&cat=-99[SQL CODE]