Cross-site scripting (XSS) vulnerability in Default.aspx in DotNetNuke 4.8.3 and earlier allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42752
http://www.securityfocus.com/archive/1/492793/100/0/threaded
http://www.dotnetnuke.com/News/SecurityPolicy/SecurityBulletinno19/tabid/1166/Default.aspx