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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Customer Relationship Management (CRM) System 1.0 - 'Category' Persistent Cross site Scripting
# Date: 14-05-2021
# Exploit Author: Vani K G
# Vendor Homepage: https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/php/14794/customer-relationship-management-crm-system-php-source-code.html
# Version: 1.0
# Tested on: Windows 10/XAMPP

Stored Cross-site scripting(XSS):
Stored XSS, also known as persistent XSS, is the more damaging of the
two. It occurs when a malicious script is injected directly into a
vulnerable web application.

Attack Vector :

This vulnerability can result in the attacker to inject the XSS
payload in the Title field of the page and each time any user will
open the website, the XSS triggers and attacker can able to steal the
cookie according to the crafted payload.

Vulnerable Parameters: Category input field.

Payload : <script>alert(document.domain)</script>

Vulnerable URL :
http://localhost/crm/admin/?page=services&view=category

Steps To Reproduce :
1) Go to the admin Dashboard
2) Click on Category and click Add New button.
3) Put Payload into the 'Category' input field.
4) Click on Save.
5) XSS payload will be triggered.