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MyBB Threads To Link 1.3 Cross Site Scripting

MyBB Threads To Link 1.3 Cross Site Scripting
Posted Apr 24, 2018
Authored by 0xB9

MyBB Threads to Link plugin version 1.3 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 96173d80bddfd3f77cb73fdb4398da9ccbd0be0229284f03a26bf59ac24808e1

MyBB Threads To Link 1.3 Cross Site Scripting

Change Mirror Download
# Exploit Title: MyBB Threads to Link Plugin v1.3 - Persistent XSS
# Date: 3/15/2018
# Author: 0xB9
# Contact: luxorforums.com/User-0xB9 or 0xB9[at]protonmail.com
# Software Link: https://community.mybb.com/mods.php?action=view&pid=1065
# 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']);

to

$thread['tlink'] = htmlspecialchars_uni($thread['tlink']);
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