Cross-site scripting (XSS) vulnerability in Website\admin\Sales\paypalipn.aspx in DotNetNuke (DNN) before 4.9.3 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors related to "name/value pairs" and "paypal IPN functionality."
http://www.securityfocus.com/bid/34484
http://www.dotnetnuke.com/News/SecurityPolicy/Securitybulletinno25/tabid/1260/Default.aspx