Alt-N MDaemon webmail 20.0.0 - 'Contact name' Stored Cross Site Scripting (XSS)

# Exploit Title: Alt-N MDaemon webmail 20.0.0 - 'Contact name' Stored Cross Site Scripting (XSS)
# Date: 2020-08-25
# Exploit Author: Kailash Bohara
# Vendor Homepage: https://www.altn.com/
# Version: Mdaemon webmail < 20.0.0
# CVE : 2020-18724

1. Go to contact section and distribution list menu. Create a new distribution list.
2. Contact name field is vulnerabile to XSS. Use the payload <img src=x onerror=alert(1)>
3. We can see execution code and after saving it, each time we visits the distribution list section the XSS pop-up is seen.