Fortinet Warns of Critical FortiMail Vulnerability Actively Exploited in Zero-Day Attacks

Fortinet has notified customers of a critical vulnerability in FortiMail, designated CVE-2026-104286, that is currently being actively exploited in…

If your organization deploys FortiMail, immediately verify the status of your instances and apply security patches released by Fortinet. Monitor your mail systems for anomalous activity or unauthorized access attempts. Consider isolating critical FortiMail devices until you confirm they are fully patched.