Microsoft 365 Copilot: Schwachstelle ermöglicht Offenlegung von Informationen
WID-SEC-2026-2914 · first 19.08.2026 · updated 19.08.2026 · CVSS 8,8
What it is about
Microsoft Copilot ist ein KI-Assistent, der in verschiedene Microsoft-Produkte integriert werden kann. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Microsoft 365 Copilot ausnutzen, um Informationen offenzulegen.
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
Am I affected?
Affected according to the BSI:
- Microsoft 365 Copilot Web
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-2026-24301 vom 2026-08-18 msrc.microsoft.com
- Varonis Research PoC vom 2026-08-18 www.varonis.com
CVE: CVE-2026-24301
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.