yh i used nikto i know its using magento cms but i don't know the version of magento it is running on and have checked exploit -db and google search exploit of magento generally have been seeing some exploit code which i don't have idea how to execute it
May I can help you by giving you the right hint by ask you some questions.
Did discover what kind of CMS e-commerce in the Swagshop? Had you also did a Dirb to look for some interesting sub maps? Use this info to look for a exploit in the Exploit-DB.
So if you stuck just ask, I am happy to help you out!