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Microsoft Security Response CenterCVE-2026-50650

.NET Framework Elevation of Privilege Vulnerability

Improper control of generation of code ('code injection') in .NET Framework allows an unauthorized attacker to elevate privileges locally.

Read the vendor bulletin Get alerts for Microsoft .NET Framework 4.8 on Windows Server
7.8CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft .NET Framework 4.8 on Windows Server 2012
  • Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)
  • Microsoft .NET Framework 4.8 on Windows Server 2016
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems

Versions the vendor lists as fixed

  • 4.8.4803.0
  • 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
  • 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0
  • 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
  • 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0
  • 4.7.4143.0
  • 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
  • 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0
  • 2.0.50727.9182 & 3.0.30729.9168
  • 4.8.9340.0
  • 2.0.50727.8983 & 3.0.30729.8978
  • 8.0.29
  • 9.0.18
  • 18.7.4
  • 17.12.22
  • 17.14.36
Next step

What the vendor recommends

Release Notes Install KB5101009. Install KB5101011. Install KB5101007. Install KB5101008. Install KB5101010. Install KB5101006. Install KB5100989. Install KB5099535. Install KB5100990. Install KB5100991. Install KB5101005. Install KB5101000. Install KB5100998. Install KB5101004. Install KB5101001. Install KB5101014. Install KB5101002. Install KB5100984. Install KB5100985. Install KB5104032. Install KB5104033.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-50650View CVSS, KEV, EPSS, and threat context
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