CVE-2020-18723: Altn MDaemon Webmail

Medium severity, CVSS 5.4. EPSS: 3.8% chance of exploitation in the next 30 days.

Stored cross-site scripting (XSS) in file attachment field in MDaemon webmail 19.5.5 allows an attacker to execute code on the email recipient side while forwarding an email to perform potentially malicious activities.

Affected products

• Altn MDaemon Webmail: before 20.0.1 (fixed in 20.0.1)

Published 2021-02-03. Last modified 2026-06-17.