Mybb bans list 1.0 crosssite scripting Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2019-02-11 | Type : webapps | Platform : php
This exploit / vulnerability Mybb bans list 1.0 crosssite scripting is for educational purposes only and if it is used you will do on your own risk!

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# Exploit Title: MyBB Bans List - Cross Site Scripting
# Date: 7/25/2018
# Author: 0xB9
# Twitter: @0xB9Sec
# Contact: 0xB9[at]pm.me
# Software Link: https://community.mybb.com/mods.php?action=view&pid=423
# Version: 1.0
# Tested on: Ubuntu 18.04
# CVE: CVE-2018-14724


1. Description:
Adds bans.php page, showing a list of banned users and the reason of ban.

Any forum user that's a mod can ban users and input a payload into the ban reason which gets executed on the bans.php page.


2. Proof of Concept:

- Have a mod account
- Ban a user
- Input the following for reason of the ban <script>alert('XSS')</script>
- Anyone to view page will execute payload