Fortinet FortiSIEM: Schwachstelle ermöglicht Darstellen falscher Informationen
WID-SEC-2026-3261 · first 09.09.2026 · updated 09.09.2026 · CVSS 3,1
What it is about
FortiSIEM ist eine SIEM-Lösung (Security Information and Event Management), die eine Echtzeitanalyse von Sicherheitswarnungen ermöglicht. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Fortinet FortiSIEM ausnutzen, um Benutzer auf eine nicht vertrauenswürdige Website umzuleiten.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- Benutzer auf eine nicht vertrauenswürdige Website umzuleiten
Am I affected?
Affected according to the BSI:
- Fortinet FortiSIEM <7.5.2
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Fortinet FortiSIEM 7.5.2
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- FortiGuard Labs PSIRT Advisory FG-IR-26-169 vom 2026-09-08 www.fortiguard.com
CVE: CVE-2026-84389
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.