Fortinet: FGFM Authentication Weakening via CLI Configuration

Description

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. Revised on 2026-08-12 00:00:00

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Fortinet

Product

FortiManager

Affected versions

FortiManager 7.6: 7.6.1 — fixed in 7.6.2
FortiManager 7.4: from 7.4.3 to 7.4.5 — fixed in 7.4.6
FortiManager 7.2: from 7.2.5 to 7.2.9 — fixed in 7.2.10
FortiManager Cloud 7.6: 7.6.1 — fixed in 7.6.2
FortiManager Cloud 7.4: from 7.4.3 to 7.4.5 — fixed in 7.4.6
FortiManager Cloud 7.2: from 7.2.5 to 7.2.9 — fixed in 7.2.10 (from the advisory and NVD; check the exact builds in the official advisory)

CVSS score

8.1

Actively exploited

Not known at this time

Source

Fortinet PSIRT – original advisory

Published

August 12, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.