Mailform Pro CGI 4.3.1 and earlier allow a remote unauthenticated attacker to obtain the user input data by having a use of the product to access a specially crafted URL.
https://www.synck.com/downloads/cgi-perl/mailformpro/index.html
https://www.synck.com/downloads/cgi-perl/mailformpro/feature_1381250709.html
https://www.synck.com/blogs/news/newsroom/detail_1661907555.html