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Fortinet Fortigate Authentication bypass by primary weakness (FG-IR-26-267)

critical Nessus Plugin ID 378603

Synopsis

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

Description

The version of Fortigate installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-26-267 advisory.

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 Fortigate version 7.2.14 or later. For 7.4.x, upgrade to Fortigate version 7.4.13 or later. For 7.6.x, upgrade to Fortigate version 7.6.8 or later. For 8.0.x, upgrade to Fortigate version 8.0.2 or later.

See Also

https://www.fortiguard.com/psirt/FG-IR-26-267

Plugin Details

Severity: Critical

ID: 378603

File Name: fortigate_FG-IR-26-267.nasl

Version: 1.1

Type: Local

Family: Firewalls

Published: 11/10/2026

Updated: 11/10/2026

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-126253

CVSS v3

Risk Factor: Critical

Base Score: 9.3

Temporal Score: 8.1

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

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

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

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-2026-126253