Microsoft Outlook: Schwachstelle ermöglicht Codeausführung
WID-SEC-2026-3542 · first 24.09.2026 · updated 24.09.2026 · CVSS 8,8
What it is about
Microsoft Office LTSC ist eine Office-Suite für Unternehmen, die als Volumenlizenz mit langfristigem Support angeboten wird. Microsoft 365 Apps ist eine Office Suite für zahlreiche Büroanwendungen. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Microsoft Outlook ausnutzen, um beliebigen Programmcode auszuführen.
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
- beliebigen Programmcode auszuführen
Am I affected?
Affected according to the BSI:
- Microsoft Office LTSC 2021
- Microsoft Office LTSC 2024
- Microsoft 365 Apps
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 vom 2026-09-23 msrc.microsoft.com
CVE: CVE-2026-70125
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.