CMSuno 1.7 - 'tgo' Stored Cross-Site Scripting (XSS) (Authenticated)

# Exploit Title: CMSuno 1.7 - 'tgo' Stored Cross-Site Scripting (XSS) (Authenticated)
# Date: 03-08-2021
# Exploit Author: splint3rsec
# Vendor Homepage: https://github.com/boiteasite
# Software Link: https://github.com/boiteasite/cmsuno
# Affected Version(s): CMSuno 1.7 (and prior)
# CVE : CVE-2021-36654

CMSuno version 1.7 and prior is vulnerable to a stored cross-site scripting.

The attacker must be authenticated to exploit the vulnerability.

The payload injection is done while updating the template's image filename, vulnerable parameter is *tgo*

Steps to reproduce:

1. Go to /uno.php and click on *plugins*
2. Click on *Logo*
3. Choose a random picture in your files repo, click on save and intercept the request
4. Edit the POST request to /uno/template/uno1/uno1.php by modifying the tgo parameter's value to ")}</style><script>VULN JS CODE HERE</script>
5. Forward the request and click on *publish*
6. Click on *See the website*
7. XSS