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Fortinet FortiSIEM 7.4.1 <= 7.4.2 / 7.5.0 <= 7.5.1 Open Redirect (FG-IR-26-169)

low Nessus Plugin ID 346824

Synopsis

The remote host is affected by a URL redirection to untrusted site vulnerability.

Description

The version of Fortinet FortiSIEM running on the remote host is 7.4.1 through 7.4.2, or 7.5.0 through 7.5.1. It is, therefore, affected by a URL redirection to untrusted site vulnerability:

 - A URL redirection to untrusted site ('open redirect') vulnerability in Fortinet FortiSIEM may allow an authenticated attacker to cause a redirection to any website via specially crafted HTTP requests.
 (CVE-2026-84389)

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

Solution

No fixed release is available at this time. Fortinet indicates that upcoming FortiSIEM versions 7.5.2 and 7.6.0 will address this issue. Refer to the vendor advisory for details.

See Also

https://fortiguard.fortinet.com/psirt/FG-IR-26-169

Plugin Details

Severity: Low

ID: 346824

File Name: fortinet_fortisiem_FG-IR-26-169.nasl

Version: 1.2

Type: Combined

Agent: unix

Family: Misc.

Published: 9/17/2026

Updated: 9/18/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

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

CVSS Score Source: CVE-2026-84389

CVSS v3

Risk Factor: Low

Base Score: 3.1

Temporal Score: 2.7

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

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

Vulnerability Information

CPE: cpe:/a:fortinet:fortisiem

Required KB Items: installed_sw/Fortinet FortiSIEM

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-84389