Microsoft 365 Copilot und Edge: Schwachstelle ermöglicht Offenlegung von Informationen und Manipulation von Daten
WID-SEC-2026-0717 · first 13.03.2026 · updated 16.03.2026 · CVSS 7,1
What it is about
Microsoft Copilot ist ein KI-Assistent, der in verschiedene Microsoft-Produkte integriert werden kann. Edge ist ein Web Browser von Microsoft. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Microsoft 365 Copilot und Microsoft Edge ausnutzen, um sensible Informationen offenzulegen oder begrenzte Änderungen vorzunehmen.
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
- sensible Informationen offenzulegen oder begrenzte Änderungen vorzunehmen
Am I affected?
Affected according to the BSI:
- Microsoft Edge Android and iOS 145.3800.99
- Microsoft 365 Copilot
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-2026-26133 vom 2026-03-12 msrc.microsoft.com
- Release notes for Microsoft Edge Security Updates vom 2026-03-12 learn.microsoft.com
- PoC vom 2026-03-12 permiso.io
CVE: CVE-2026-26133
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.