CVE-2023-36553: Fortinet Fortisiem

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiSIEM version 5.4.0 and 5.3.0 through 5.3.3 and 5.2.5 through 5.2.8 and 5.2.1 through 5.2.2 and 5.1.0 through 5.1.3 and 5.0.0 through 5.0.1 and 4.10.0 and 4.9.0 and 4.7.2 allows attacker to execute unauthorized code or commands via crafted API requests.

Affected products

• Fortinet Fortisiem: from 5.1.0, up to and including 5.1.3; version 4.7.2 only; version 4.9.0 only; version 4.10.0 only; version 5.0.0 only; version 5.0.1 only; …

Published 2023-11-14. Last modified 2026-06-17.