MyBB Threads To Link 1.3 Cross Site Scripting

Type packetstorm
Reporter 0xB9
Modified 2018-04-24T00:00:00


                                            `# Exploit Title: MyBB Threads to Link Plugin v1.3 - Persistent XSS  
# Date: 3/15/2018  
# Author: 0xB9  
# Contact: or 0xB9[at]  
# Software Link:  
# Version: v1.3  
# Tested on: Ubuntu 17.10  
1. Description:  
When editing a thread the user is given to the option to convert the thread to a link.  
2. Proof of Concept:  
Persistent XSS  
- Edit a thread or post you've made  
- At the bottom of the edit page in the Thread Link box input the following <a """><SCRIPT>alert("XSS")</SCRIPT>">  
- Now visit the forum your thread/post exists in to see the alert.  
3. Solution:  
The plugin has since been removed after notifying the author.  
Patch in line 83:  
$thread['tlink'] = ($thread['tlink']);  
$thread['tlink'] = htmlspecialchars_uni($thread['tlink']);