05/28/2026
If your business uses Fortinet FortiClient endpoint security, there is an active exploitation campaign you should know about right now.
Researchers at Arctic Wolf discovered that attackers are exploiting CVE-2026-35616, a vulnerability in FortiClient EMS (the central management server). What makes this effective: attackers do not target individual devices. They compromise the management server and use it to push malware to every managed endpoint at once.
The malware (EKZ Infostealer) steals saved passwords from Chrome, Edge, and Firefox - and session cookies that can bypass MFA on Microsoft 365 and cloud applications.
Three things to check today:
1. Is FortiClient EMS patched against CVE-2026-35616?
2. Is management port 8013 restricted to trusted IPs?
3. Any unexpected scripts in VPN Remote Access Profiles?
Full breakdown with IOCs and step-by-step remediation on our blog.
Attackers are actively exploiting CVE-2026-35616 in FortiClient EMS to steal passwords and bypass MFA. Here's what to do if your business uses Fortinet.