mybb ougc feedback plugin 1.8.22 crosssite scripting

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# Exploit Title: MyBB OUGC Feedback Plugin 1.8.22 - Cross-Site Scripting
# Date: 1/30/2021
# Author: 0xB9
# Twitter: @0xB9Sec
# Contact: 0xB9[at]pm.me
# Software Link: https://community.mybb.com/mods.php?action=view&pid=1220
# Version: 1.8.22
# Tested on: Windows 10
# CVE: CVE-2021-28115

1. Description:
This plugin adds a feedback system to your forum. Edit feedback button is vulnerable to XSS.

2. Proof of Concept:

- Go to a user profile
- Add feedback and leave the following payload as comment   "><script>alert(1)</script>
- View the feedback feedback.php?uid=2 
- When clicking Edit payload will execute

Mybb ougc feedback plugin 1.8.22 crosssite scripting Vulnerability / Exploit Source : Mybb ougc feedback plugin 1.8.22 crosssite scripting

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