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Fortinet FortiClient EMS 7.4.5 / 7.4.6 API Authentication Bypass (FG-IR-26-099)

critical Nessus Plugin ID 305855

Synopsis

The remote host is affected by an authentication bypass vulnerability.

Description

The version of Fortinet FortiClient EMS installed on the remote host is 7.4.5 or 7.4.6. It is, therefore, affected by an authentication bypass vulnerability:

 - An improper access control vulnerability [CWE-284] in FortiClient EMS may allow an unauthenticated attacker to execute unauthorized code or commands via crafted requests. Fortinet has observed this vulnerability to be exploited in the wild. (CVE-2026-35616)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the FortiClient EMS 7.4.5 or 7.4.6 hotfix, or upgrade to FortiClient EMS version 7.4.7 or later.

See Also

https://fortiguard.fortinet.com/psirt/FG-IR-26-099

Plugin Details

Severity: Critical

ID: 305855

File Name: fortinet_forticlient_ems_FG-IR-26-099.nasl

Version: 1.2

Type: Combined

Agent: windows

Family: Misc.

Published: 4/10/2026

Updated: 4/10/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-35616

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:fortinet:forticlient_enterprise_management_server

Required KB Items: installed_sw/Fortinet FortiClient EMS, Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/4/2026

Vulnerability Publication Date: 4/4/2026

CISA Known Exploited Vulnerability Due Dates: 4/9/2026

Reference Information

CVE: CVE-2026-35616