mailfile.cgi CGI program in MailFile 1.10 allows remote attackers to read arbitrary files by specifying the target file name in the "filename" parameter in a POST request, which is then sent by email to the address specified in the "email" parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5358
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-0964
http://www.securityfocus.com/bid/1807
http://archives.neohapsis.com/archives/bugtraq/2000-10/0172.html