FlatCore CMS 2.1.1 - Stored Cross-Site Scripting (XSS)

# Exploit Title: FlatCore CMS 2.1.1 -Stored Cross Site Scripting
# Date: 2020-09-24
# Exploit Author: Sinem Şahin
# Vendor Homepage: https://flatcore.org/
# Version: 2.1.1
# Tested on: Windows & XAMPP

==> Tutorial <==

1- Go to the following url. => http://(HOST)/install/index.php
2- Write XSS Payload into the username of the user account.
3- Press "Save" button.

XSS Payload ==> "<script>alert("usernameXSS")</script>