Microsoft Teams: Schwachstelle ermöglicht Offenlegung von Informationen
WID-SEC-2026-1413 · first 08.05.2026 · updated 08.05.2026 · CVSS 9,6
What it is about
Microsoft Teams ist ein Kollaborations-, Kommunikations- und Videokonferenz-Tool. Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Microsoft Teams ausnutzen, um Informationen offenzulegen.
Under what conditions?
Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.
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 Teams
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
CVE: CVE-2026-33823
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.