Microsoft 365 Copilot: Mehrere Schwachstellen
WID-SEC-2026-0795 · first 20.03.2026 · updated 20.03.2026 · CVSS 8,9
What it is about
Microsoft Copilot ist ein KI-Assistent, der in verschiedene Microsoft-Produkte integriert werden kann. Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Microsoft 365 Copilot ausnutzen, um Informationen offenzulegen, Daten zu manipulieren und erweiterte Berechtigungen zu erlangen.
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
- Informationen offenzulegen
- Daten zu manipulieren
- erweiterte Berechtigungen zu erlangen
Am I affected?
Affected according to the BSI:
- Microsoft 365 Copilot
- Microsoft 365 Copilot BizChat
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 Security Update Guide CVE-2026-24299 vom 2026-03-19 msrc.microsoft.com
- Microsoft Security Update Guide CVE-2026-26136 vom 2026-03-19 msrc.microsoft.com
- Microsoft Security Update Guide CVE-2026-26137 vom 2026-03-19 msrc.microsoft.com
- Microsoft Leitfaden für Sicherheitsupdates vom 2026-03-19 msrc.microsoft.com
CVE: CVE-2026-24299, CVE-2026-26136, CVE-2026-26137
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.