Entra ID
CVE-2026-50652: Azure Active Directory Denial of Service Vulnerability
Deserialization of untrusted data in Azure Active Directory allows an unauthorized attacker to deny service over a network.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 3.1 7.5
EPSS1.7%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Azure Active Directory 2021 | 5.7.1 or later |
| Microsoft .NET Framework 3.5 (Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)) 3.5 | 2.0.50727.9182 & 3.0.30729.9168 or later |
| Microsoft .NET Framework 3.5 AND 4.7.2 (Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation)) 4.7 | 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 or later |
| Microsoft .NET Framework 3.5 AND 4.8 (Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation)) 4.8 | 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 or later |
| Microsoft .NET Framework 3.5 AND 4.8.1 (Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows Server 2022, Windows Server 2022 (Server Core installation)) 4.8 | 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 or later |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 (Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)) 4.7 | 4.7.4143.0 or later |
| Microsoft .NET Framework 4.8 (Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation)) 4.8 | 4.8.4803.0 or later |
| Microsoft .NET Framework 4.8.1 (Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems) 4.8 | 4.8.9340.0 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Deserialization of untrusted data in Azure Active Directory allows an unauthorized attacker to deny service over a network.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.