CVE-2025-59923: Fortinet Fortiauthenticator

Low severity, CVSS 2.7. EPSS: 0.2% chance of exploitation in the next 30 days.

An improper access control vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow an authenticated attacker with at least read-only admin permission to obtain the credentials of other administrators' messaging services via crafted requests.

Affected products

• Fortinet Fortiauthenticator: from 6.3.0, up to and including 6.6.4

Published 2025-12-09. Last modified 2026-06-17.