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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: Opencart 3.x.x Authenticated Stored XSS
# Date: 08/15/2019
# Exploit Author: Nipun Somani
# Author Web: http://thehackerstore.net
# Vendor Homepage: https://www.opencart.com/
# Software Link: https://github.com/opencart/opencart
# Version: 3.x.x
# Tested on: Debian 9, Windows 10 x64
# CVE : CVE-2019-15081


Description:
The Opencart Version 3.x.x allows editing Source/HTML of the Categories /
Product / Information pages in the admin panel which isn't sanitized to
user input allowing for an attacker to execute arbitrary javascript code
leading to Stored Cross-Site-Scripting(XSS).

Proof-of-Concept(POC):

1. Log-in to admin-panel.
2. Navigate to Catlog and then select any of [Categories or Products or Information] options and and pick any entry or create one.
3. Under description click on Source option and insert your XSS payload.
i.e: "><script>alert("XSS")</script>
4. Now visit the modified page of your public website. And your injected XSS payload will execute.