source: https://www.securityfocus.com/bid/20333/info

Yener Haber Script 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/?x=2&kategori=11&id=-1%20union+select+id,kullanici_adi,sifre+from+admin