CVE-2026-50653: Azure Active Directory Denial of Service Vulnerability
This Microsoft advisory covers CVE-2026-50653 in Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8 on Windows Server 2012 R2 and Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019.
- CVE-2026-50653
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- 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 and 4 more below
- Fixed in
- KB5101014 (build 2.0.50727.9182 & 3.0.30729.9168), KB5101002 (build 4.8.9340.0), KB5101007 (build 4.8.4803.0) and 5 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
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.
Text from the source record.
- 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 ·verify at source
How to fix CVE-2026-50653
Upgrade to a fixed release named by Microsoft:
- 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)
Vendor guidance
- Install the applicable security update for your platform: KB5101014, KB5101002, KB5101007, KB5101009, KB5101011, KB5101008 (see the Microsoft Update Catalog).
End-of-life dates for Windows Server
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