Advanced Guestbook v1.0 Homepage: http://www.sport-slo.net/ Affected files: guestbook.php ----------------------------------------------- XSS vuln on guestbook.php: Data isn't sanatized before being submit to guestbook.txt and displayed onscreen. The code: if($_POST['action']) { if($_POST['name'] && $_POST['form']) { $action = $_POST['name'] . "@" . $_POST['form'] . "@" . $ip . "@" . $date . "n"; $handler = fopen("guestbook.txt", "a"); fputs($handler, $action); fclose($handler); print "Thank you!"; For a PoC as your name or opinion put: <script>alert('xss')</script> It should also be noted that this script comes with the dir /guestbook/and inside that is the cjGuestbook v1.2. v1.3 (which is a newer version) of cj'sguestbook has XSS vulns which i've submitted before.