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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: Online Hotel Reservation System 1.0 - Stored Cross-site Scripting
# Exploit Author: Mesut Cetin
# Date: 2021-01-14
# Vendor Homepage: https://www.sourcecodester.com/php/13492/online-hotel-reservation-system-phpmysqli.html
# Software Link: https://www.sourcecodester.com/download-code?nid=13492&title=Online+Hotel+Reservation+System+in+PHP%2FMySQLi+with+Source+Code
# Version: 1.0
# Tested on: Kali Linux 2020.4, PHP 7.4.13, mysqlnd 7.4.13, Apache/2.4.46 (Unix), OpenSSL/1.1.1h, mod_perl/2.0.11 Perl/v5.32.0

######## Description ########

The room 'description' parameter is vulnerable to stored Cross-site Scripting.


######## Proof of Concept #########

Login with administrator credentials at http://localhost/admin with admin:admin and click on "Rooms" tab.

Edit "description" parameter:

1<script>alert('document.cookie')</script>

Any user at http://localhost/marimar/index.php will get the XSS pop-up warning with their cookie values.