News FortiMail Zero-Day: Unauthenticated File Writes on Your Mail Gateway Are Being Exploited by Rebecca Sutton October 3, 2026 by Rebecca Sutton October 3, 2026 Fortinet has confirmed active exploitation of CVE-2026-104286, a CVSS 9.8 flaw in FortiMail. Here is what it does, who is affected and what to do before a fix reaches you. FacebookTwitterLinkedinEmail