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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: Point of Sale System 1.0 - Multiple Stored XSS
# Exploit Author: Saeed Bala Ahmed (r0b0tG4nG)
# Date: 2020-12-18
# Vendor Homepage: https://www.sourcecodester.com/php/9620/point-sale-system-pos.html
# Software Link: https://www.sourcecodester.com/download-code?nid=9620&title=Point+of+Sale+System+%28POS%29+using+PHP+with+Source+Code
# Affected Version: Version 1
# Tested on: Parrot OS

Step 1. Login to the application with admin credentials

Step 2. Click on "Suppliers" in header and select "Add Supplier".

Step 3. Input "<script>alert("r0b0tG4nG")</script>" in all fields of the form.
Note: Stored XSS vulnerability can also be found "Customers Page" when you select "Add New Customer". Apply Same method above to execute Stored XSS.

Step 4. Click on "Save" when done and this will trigger the Stored XSS payloads. Whenever you click on "Suppliers Page", your XSS Payloads will be triggered.

Note: Stored XSS can also be triggered when you click on "Products Page" and select "Add New Product".