An Authentication Bypass Using an Alternate Path or Channel [CWE-288] vulnerability in FortiManager and FortiManager Cloud may allow a remote unauthenticated attacker to impersonate any FortiGate managed by the FortiManager with a specific CLI option set via crafted FGFM requests if the attacker has a valid certificate.
As workaround fgfm-peercert-withoutsn should be disabled :
config system global set fgfm-peercert-withoutsn disable end
2026-08-12: Initial publication
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