Prometheus - most of this "bugs" are fixed some time ago. Some "bugs" are fake because for example there is "SQL Injection". It is fake because Quick.Cart is not based on SQL database. Another problem is that sites with this "bugs reporting" when we sent them email that this bug was fixed in x.x version they dont change this bugs info. And it is still there without any notification that this bug was fixed in x.x version.
Please read change log to know more fixes we made: http://opensolution.org/download/Quick.Cart/changeLog.txt
About this bug You written: http://downloads.securityfocus.com/vulnerabilities/exploits/24299.php