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Microsoft Security Response CenterCVE-2026-62909

.NET Elevation of Privilege Vulnerability

Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.

Read the vendor bulletin Get alerts for NET 10.0 installed on Linux
7.8CVSS out of 10High severity
Scope

What the vendor says is affected

  • .NET 10.0 installed on Linux
  • .NET 8.0 installed on Linux
  • .NET 9.0 installed on Linux
  • Microsoft Visual Studio 2026 version 18.8
  • .NET 10.0 installed on Mac OS
  • .NET 10.0 installed on Windows
  • .NET 8.0 installed on Windows
  • .NET 8.0 installed on Mac OS
  • .NET 9.0 installed on Mac OS
  • Microsoft Visual Studio 2022 version 17.14
  • .NET 9.0 installed on Windows

Versions the vendor lists as fixed

  • 10.0.11
  • 8.0.30
  • 9.0.19
  • 18.8.3
  • 17.14.38
Next step

What the vendor recommends

Install KB5122106. Install KB5122104. Install KB5122105.

Review the complete instructions on the vendor's site
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • The vendor changed its remediation guidance.
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-62909View CVSS, KEV, EPSS, and threat context
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