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Fortinet FortiMail Path Traversal / NULL Byte Arbitrary File Write (FG-IR-26-175)

critical Nessus Plugin ID 363130

Synopsis

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

Description

The version of FortiMail installed on the remote host is affected by a path traversal vulnerability as referenced in the FG-IR-26-175 advisory.

 - An improper limitation of a pathname to a restricted directory ('Path Traversal') combined with an improper neutralization of NULL byte or NULL character vulnerability in FortiMail may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
 (CVE-2026-104286)

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 FortiMail version 7.4.9 or later. For 7.4.x, upgrade to FortiMail version 7.4.9 or later.
For 7.6.x, upgrade to FortiMail version 7.6.7 or later. For 8.0.x, upgrade to FortiMail version 8.0.2 or later.

See Also

https://www.fortiguard.com/psirt/FG-IR-26-175

Plugin Details

Severity: Critical

ID: 363130

File Name: fortigate_fortimail_FG-IR-26-175.nasl

Version: 1.1

Type: Local

Family: Firewalls

Published: 10/6/2026

Updated: 10/6/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Percentile: 99.87

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2026-104286

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/a:fortinet:fortimail

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

Patch Publication Date: 10/1/2026

Vulnerability Publication Date: 10/1/2026

CISA Known Exploited Vulnerability Due Dates: 10/4/2026

Reference Information

CVE: CVE-2026-104286