CVE-2023-26208: Fortinet Fortiauthenticator

Medium severity, CVSS 5.3. EPSS: 1.8% chance of exploitation in the next 30 days.

A improper restriction of excessive authentication attempts vulnerability [CWE-307] in Fortinet FortiAuthenticator 6.4.x and before allows a remote unauthenticated attacker to partially exhaust CPU and memory via sending numerous HTTP requests to the login form.

Affected products

• Fortinet Fortiauthenticator: from 5.4.0, before 6.5.0 (fixed in 6.5.0)

Published 2023-03-09. Last modified 2026-06-17.