MyBB OUGC Feedback 1.8.22 Cross Site Scripting

CVE Category Price Severity
CVE-2021-28115 CWE-79 N/A High
Author Risk Exploitation Type Date
Unknown High Remote 2021-03-15
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

MyBB OUGC Feedback 1.8.22 Cross Site Scripting
# Exploit Title: MyBB OUGC Feedback Plugin 1.8.22 - Cross-Site Scripting
# Date: 1/30/2021
# Author: 0xB9
# Twitter: @0xB9Sec
# Contact: 0xB9[at]
# Software Link:
# 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

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