Open Redirect in Fortinet FortiSIEM (CVE-2026-84389)
Summary
Vulnerability in Fortinet FortiSIEM (CVE-2026-84389). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-84389 has been found in Fortinet FortiSIEM.
Risk of unauthorized operations or information disclosure. CVSS score: 3.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Fortinet FortiSIEM CVE-2026-84389" on the vendor's site.
CVE-2026-84389 (Fortinet FortiSIEM) — CWE-601 / CVSS v3 3.1
Attack vector: remote (network-reachable) / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-601) exists in Fortinet FortiSIEM.
Check the vendor advisory for the affected versions of Fortinet FortiSIEM.
Severity: Low (CVSS 3.1/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Fortinet FortiSIEM を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web fortiguard.fortinet.com
- web nvd.nist.gov
- web github.com