Microstrategy Web, version 7, does not sufficiently encode user-controlled inputs, resulting in a Cross-Site Scripting (XSS) vulnerability via the Login.asp Msg parameter. NOTE: this is a deprecated product.
https://www.exploit-db.com/exploits/45755/
http://packetstormsecurity.com/files/150059/Microstrategy-Web-7-Cross-Site-Scripting-Traversal.html