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High7.5Microsoft Server

High [CVE-2026-50653] Azure Active Directory Denial of Service Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-50653 affecting Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019.

CVE-2026-50653 Published Jul 14, 2026Updated by vendor Jul 16, 2026
CVE-2026-50653
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Azure Active Directory Denial of Service Vulnerability

Affected products named by the advisory: Microsoft.NET Framework 4.8 on Windows Server 2016; Microsoft.NET Framework 4.8 on Windows Server 2012; Microsoft.NET Framework 4.8 on Windows Server 2012 R2; Microsoft.NET Framework 3.5 AND 4.8 on Windows Server 2019; and 4 more.

Affected products named by the advisory: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012.

Affected versions
  • Azure Active Directory 2021 before 8.19.2
  • Microsoft .NET Framework 3.5 3.5.0 before 2.0.50727.8983 & 3.0.30729.8978
  • Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
  • Microsoft .NET Framework 3.5 AND 4.8 4.8.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
  • Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1 before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0 before 4.7.4143.0
  • Microsoft .NET Framework 4.8 4.8.0 before 4.8.4803.0

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions
  • KB5101014 (build 2.0.50727.9182 & 3.0.30729.9168)
  • KB5101002 (build 4.8.9340.0)
  • KB5101007 (build 4.8.4803.0)
  • KB5101009 (build 4.8.4803.0)
  • KB5101011 (build 4.8.4803.0)
  • KB5101008 (build 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0)
  • KB5101010 (build 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0)
  • KB5101006 (build 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0)

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Install the applicable security update for your platform: KB5101014, KB5101002, KB5101007, KB5101009, KB5101011, KB5101008 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

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