Fortinet FortiOS und FortiProxy: Mehrere Schwachstellen
WID-SEC-2026-2328 · first 15.07.2026 · updated 15.07.2026 · CVSS 6,6
What it is about
FortiOS ist ein gehärtetes Betriebssystem für FortiGate Plattformen. FortiProxy ist eine Web-Proxy Lösung. Ein Angreifer kann mehrere Schwachstellen in Fortinet FortiOS und Fortinet FortiProxy ausnutzen, um beliebigen Programmcode auszuführen einen Cross Site Scripting Angriff durchzuführen und Daten 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
- beliebigen Programmcode auszuführen einen Cross Site Scripting Angriff durchzuführen
- Daten zu manipulieren
Am I affected?
Affected according to the BSI:
- Fortinet FortiOS <7.4.2
- Fortinet FortiOS <7.4.10
- Fortinet FortiProxy <7.4.14
- Fortinet FortiOS <7.6.7
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Fortinet FortiOS 7.4.2
- Fortinet FortiOS 7.4.10
- Fortinet FortiProxy 7.4.14
- Fortinet FortiOS 7.6.7
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-26-148 vom 2026-07-14 www.fortiguard.com
- FortiGuard Labs PSIRT Advisory FG-IR-26-150 vom 2026-07-14 www.fortiguard.com
- FortiGuard Labs PSIRT Advisory FG-IR-26-151 vom 2026-07-14 www.fortiguard.com
CVE: CVE-2026-59837, CVE-2026-23573, CVE-2026-59839
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.