WordPress Custom Global Variables 1.0.5 Cross Site Scripting

WordPress Custom Global Variables plugin version 1.0.5 suffers from a persistent cross site scripting vulnerability.

MD5 | 2d80e7fb324be961dcb746d929730fdc

# Exploit Title: WordPress Plugin Custom Global Variables 1.0.5 - 'name' Stored Cross-Site Scripting (XSS) 
# Google Dork: NA
# Date: 09/01/2021
# Exploit Author: Swapnil Subhash Bodekar
# Vendor Homepage:
# Software Link: https://wordpress.org/plugins/custom-global-variables/#developers
# Version: 1.0.5
# Tested on Windows

How to reproduce vulnerability:

1. Install WordPress 5.6
2. Install and activate Custom Global variables plugin.
3. Navigate to Setting >> Custom Global Variables and enter the data into the user input field.
4. Capture the request into burp suite and append the JavaScript payload which is mentioned below
5. You will observe that the payload successfully got stored into the database and when you are triggering the same functionality in that time JavaScript payload is executing successfully and we are getting a pop-up.

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