CGI versions before 5.00 for Perl allow HTML injection via text containing --> in comment.
Arguments are placed between without escaping, so text containing --> closes the comment early.
An application that passes request data to comment can be made to inject HTML into the page.
Improper Neutralization of Input During Web Page Generation The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.