Threat landscape
high

Microsoft DeveloperTools (Visual Studio Code und .NET): Mehrere Schwachstellen

WID-SEC-2026-0367 · first 11.02.2026 · updated 07.04.2026 · CVSS 8,8

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What it is about

Visual Studio Code ist ein Quelltext-Editor von Microsoft. Microsoft Visual Studio ist eine integrierte Entwicklungsumgebung für Hochsprachen. Ein Angreifer kann mehrere Schwachstellen in Microsoft Visual Studio, Visual Studio Code und .NET ausnutzen, um sich erhöhte Rechte zu verschaffen, beliebigen Code auszuführen, Spoofing-Angriffe zu starten und die Authentifizierung zu umgehen.

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

  • sich erhöhte Rechte zu verschaffen
  • beliebigen Code auszuführen
  • Spoofing-Angriffe zu starten
  • die Authentifizierung zu umgehen

Am I affected?

Affected according to the BSI:

  • Ubuntu Linux
  • Microsoft .NET Framework 8.0
  • Microsoft .NET Framework 9.0
  • Microsoft Visual Studio Code
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2022 version 18.3
  • Microsoft .NET Framework 10.0

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

CVE: CVE-2026-21218, CVE-2026-21256, CVE-2026-21257, CVE-2026-21518, CVE-2026-21523

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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