Cross-site scripting (XSS) vulnerability in login.asp in PortalApp 3.3 and earlier allows remote attackers to inject arbitrary web script or HTML via the ret_page parameter.
http://www.vupen.com/english/advisories/2005/3037
http://secunia.com/advisories/18201
http://pridels0.blogspot.com/2005/12/portalapp-xss-vuln.html