source: https://www.securityfocus.com/bid/15911/info

iHTML Merchant 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.

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/merchant.ihtml?id=56&step=[SQL]
http://www.example.com/merchant.ihtml?id=[SQL]
http://www.example.com/merchant.ihtml?pid=[SQL]