Fortinet FortiOS: Schwachstelle ermöglicht Manipulation von Dateien
WID-SEC-2026-1095 · first 15.04.2026 · updated 15.04.2026 · CVSS 6,5
What it is about
FortiOS ist ein gehärtetes Betriebssystem für FortiGate Plattformen. Ein Angreifer aus einem angrenzenden Netzwerk kann eine Schwachstelle in Fortinet FortiOS ausnutzen, um Dateien zu manipulieren.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Dateien zu manipulieren
Am I affected?
Affected according to the BSI:
- Fortinet FortiOS <7.2.12
- Fortinet FortiOS <7.4.9
- Fortinet FortiOS <7.6.4
- Fortinet FortiOS <7.0.18
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Fortinet FortiOS 7.2.12
- Fortinet FortiOS 7.4.9
- Fortinet FortiOS 7.6.4
- Fortinet FortiOS 7.0.18
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-26-125 vom 2026-04-14 www.fortiguard.com
CVE: CVE-2025-53847
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.