Microsoft Azure Portal Windows Admin Center: Schwachstelle ermöglicht Erlangen von Administratorrechten
WID-SEC-2026-1602 · first 20.05.2026 · updated 21.05.2026 · CVSS 7,8
What it is about
Microsoft Windows Admin Center ist ein webbasiertes Tool zur Verwaltung von Windows Servern, Clustern und PCs. Ein lokaler Angreifer kann eine Schwachstelle in Microsoft Azure Portal Windows Admin Center ausnutzen, um Administratorrechte zu erlangen.
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
- Administratorrechte zu erlangen
Am I affected?
Affected according to the BSI:
- Microsoft Windows Admin Center in Azure Portal
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
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 CVE-2026-42834 vom 2026-05-19 msrc.microsoft.com
CVE: CVE-2026-42834
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.