The TIPS MailPost application is affected by a remote file enumeration vulnerability. This vulnerability arises due to the application's failure to properly sanitize user requests. An attacker can exploit this vulnerability to gain knowledge of the existence of files outside the Web root directory. By accessing the URL 'http://www.example.com/scripts/mailpost.exe/..%255c..%255c..%255cwinnt/system.ini?*nosend*=&email=test@procheckup.com', an attacker can enumerate the contents of the 'winnt/system.ini' file, which can then be used to facilitate further attacks.