Fortinet FortiManager FGFM elevation before registration password is verified (FG-IR-26-275)

critical Nessus Plugin ID 378541

Synopsis

Fortinet Firewall is missing one or more security-related updates.

Description

The version of FortiManager installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-26-275 advisory.

- A improper authorization vulnerability in Fortinet FortiManager 8.0.0, FortiManager 7.6.0 through 7.6.7, FortiManager 7.4.0 through 7.4.5, FortiManager 7.2.0 through 7.2.8 may allow an unauthenticated attacker that can reach the FGFM port to execute code or commands via crafted FGFM packets. (CVE-2026-126261)

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

Solution

For 7.2.x, upgrade to FortiManager version 7.2.9 or later. For 7.4.x, upgrade to FortiManager version 7.4.6 or later.
For 7.6.x, upgrade to FortiManager version 7.6.8 or later. For 8.0.x, upgrade to FortiManager version 8.0.1 or later.

Plugin Details

Severity: Critical

ID: 378541

File Name: fortimanager_FG-IR-26-275.nasl

Version: 1.1

Type: Local

Family: Firewalls

Published: 11/10/2026

Updated: 11/10/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.49

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-126261

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:fortinet:fortimanager

Required KB Items: Host/Fortigate/model, Host/Fortigate/version

Exploit Ease: No known exploits are available

Patch Publication Date: 11/10/2026

Vulnerability Publication Date: 11/10/2026

Reference Information

CVE: CVE-2026-126261

Detections

Analytics