Backdrop CMS 1.23.0 - Stored XSS

# Exploit Title: Backdrop CMS 1.23.0 - Stored Cross-Site Scripting - Post Body Field
# Date: 2023-08-21
# Exploit Author: Sinem Şahin
# Vendor Homepage: https://backdropcms.org/
# Version: 1.23.0
# Tested on: Windows & XAMPP

==> Tutorial <==

1- Go to the following url. => http://(HOST)/backdrop/node/add/post
2- Write your xss payload in the body of the post. Formatting options should be RAW HTML to choose from.
3- Press "Save" button.

XSS Payload ==> "<script>alert("post_body")</script>