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Cyber Security Agency of Singapore
Alerts

Active Exploitation of Critical Vulnerability in FortiClient EMS

6 April 2026

Fortinet has released security updates to address a critical security vulnerability in FortiClient EMS. Users and administrators of affected versions are advised to install the hotfix immediately and update to the latest version once available.

Background

Fortinet has released security updates to address a critical improper access control vulnerability (CVE-2026-35616) affecting FortiClient EMS. The vulnerability has a Common Vulnerability Scoring System (CVSS v3.1) score of 9.8 out of 10.

Impact

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute unauthorised code or commands via crafted requests, potentially resulting in a full compromise of the FortiClient EMS server.

Known Exploitation

This vulnerability is reportedly being exploited in the wild.

Affected Products

This vulnerability affects FortiClient EMS versions 7.4.5 through 7.4.6.

Mitigation

Users and administrators of affected products are advised to install the hotfix by following the instructions provided in Fortinet’s advisory (opens in new tab) and update to the latest version once available.

References

https://thehackernews.com/2026/04/fortinet-patches-actively-exploited-cve.html (opens in new tab) 

https://fortiguard.fortinet.com/psirt/FG-IR-26-099 (opens in new tab) 

https://nvd.nist.gov/vuln/detail/CVE-2026-35616 (opens in new tab)