CVE-2026-84389

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Open Redirect Vulnerability in Fortinet FortiSIEM

Publication date: 2026-09-08

Last updated on: 2026-09-10

Assigner: Fortinet, Inc.

Description

A url redirection to untrusted site ('open redirect') vulnerability in Fortinet FortiSIEM 7.5.0 through 7.5.1, FortiSIEM 7.4.1 through 7.4.2 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-10

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-84389

Affected Vendors & Products

Vendor	Product	Version / Range
fortinet	fortisiem	From 7.5.0 (inc) to 7.5.1 (inc)
fortinet	fortisiem	From 7.4.1 (inc) to 7.4.2 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-601	The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Attack-Flow Graph

Executive Summary

This is an open redirect vulnerability in Fortinet FortiSIEM versions 7.5.0 through 7.5.1 and 7.4.1 through 7.4.2. It allows attackers to trick users into visiting untrusted websites by manipulating URLs, potentially leading to unauthorized actions or code execution.

Impact Analysis

An attacker could exploit this to redirect users to malicious sites, steal credentials, or deliver malware. Users might unknowingly expose sensitive data or grant unauthorized access to systems.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR (data protection) and HIPAA (health data privacy). Organizations may face fines, legal penalties, and reputational damage for failing to protect user data.

Mitigation Strategies

Update FortiSIEM to a patched version beyond 7.5.1 or 7.4.2. Monitor network traffic for unusual URL redirections. Restrict user input validation for URLs in web interfaces.

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