Threat landscape
high exploited

Microsoft SharePoint Server 2016 und SharePoint Server 2019: Schwachstelle ermöglicht Codeausführung

WID-SEC-2026-1652 · first 22.05.2026 · updated 02.07.2026 · CVSS 8,8

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What it is about

Microsoft Sharepoint Services ist ein Portalsystem für die zentrale Verwaltung von Dokumenten und Anwendungen. Die Inhalte werden u.a. über Webseiten zur Verfügung gestellt. Microsoft Sharepoint ist ein Portalsystem für die zentrale Verwaltung von Dokumenten und Anwendungen. Die Inhalte werden u. a. über Webseiten zur Verfügung gestellt. Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Microsoft SharePoint Server 2016, Microsoft SharePoint Server 2019 und Microsoft SharePoint ausnutzen, um beliebigen Programmcode auszuführen.

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

  • beliebigen Programmcode auszuführen

Am I affected?

Affected according to the BSI:

  • Microsoft SharePoint Server 2016 <16.0.5552.1002
  • Microsoft SharePoint Server 2019 <16.0.10417.20128
  • Microsoft SharePoint Server Subscription Edition <16.0.19725.20280

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Microsoft SharePoint Server 2016 16.0.5552.1002
  • Microsoft SharePoint Server 2019 16.0.10417.20128
  • Microsoft SharePoint Server Subscription Edition 16.0.19725.20280

Is the vulnerability already being exploited?

  • CVE-2026-45659: exploited in the wild according to CISA, in the catalogue since 01.07.2026, also for ransomware.

Information and sources

CVE: CVE-2026-45659

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.

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