Microsoft Windows 11 (Secure Kernel Mode): Schwachstelle ermöglicht Privilegieneskalation
WID-SEC-2026-3348 · first 15.09.2026 · updated 15.09.2026 · CVSS 8,2
What it is about
Windows ist ein Betriebssystem von Microsoft. Ein lokaler Angreifer kann eine Schwachstelle in Microsoft Windows 11 (Secure Kernel Mode) ausnutzen, um seine Privilegien zu erhöhen.
Under what conditions?
Only with access to the device or an account on it. Often the second step after a phishing email.
What can happen in the worst case
An attacker could use the vulnerability to
- seine Privilegien zu erhöhen
Am I affected?
Affected according to the BSI:
- Microsoft Windows 11 26H1 <10.0.28000.2956
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Microsoft Windows 11 26H1 10.0.28000.2956
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)
- Microsoft Security Update Guide vom 2026-09-14 msrc.microsoft.com
CVE: CVE-2026-85921
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.