Microsoft Apps (Authenticator und 365 Copilot): Mehrere Schwachstellen
WID-SEC-2026-3457 · first 18.09.2026 · updated 18.09.2026 · CVSS 9,9
What it is about
Microsoft Authenticator ist eine App, die zur Zwei-Faktor-Authentifizierung und Kontoverwaltung verwendet wird. Microsoft Copilot ist ein KI-Assistent, der in verschiedene Microsoft-Produkte integriert werden kann. Ein Angreifer kann mehrere Schwachstellen in Microsoft Authenticator und Microsoft 365 Copilot ausnutzen, um seine Privilegien zu erhöhen, und um Informationen offenzulegen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- seine Privilegien zu erhöhen
- Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Microsoft Authenticator for Android
- Microsoft 365 Copilot
- Microsoft 365 Copilot 365 Copilot's Business Chat
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 Leitfaden für Sicherheitsupdates msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-80097 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-58611 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-85885 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-85887 msrc.microsoft.com
- Microsoft Security Advisory CVE-2026-78501 msrc.microsoft.com
CVE: CVE-2026-78501, CVE-2026-85885, CVE-2026-85887
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.