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CVE-2026-50647— Active Directory Federation Server Denial of Service Vulnerability

CVSS 7.5 · High EPSS 1.10% · P62

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 24

VendorProductVersion RangeStatus
MicrosoftMicrosoft .NET Framework 3.53.5.0< 2.0.50727.8983 & 3.0.30729.8978affected
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.24.7.0< 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0affected
MicrosoftMicrosoft .NET Framework 3.5 AND 4.84.8.0< 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0affected
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8.14.8.1< 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0affected
MicrosoftMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.24.7.0< 4.7.4143.0affected
MicrosoftMicrosoft .NET Framework 4.84.8.0< 4.8.4803.0affected
MicrosoftWindows 10 Version 160710.0.14393.0< 10.0.14393.9339affected
MicrosoftWindows 10 Version 180910.0.17763.0< 10.0.17763.9020affected
MicrosoftWindows 10 Version 21H210.0.19044.0< 10.0.19044.7548affected
MicrosoftWindows 10 Version 22H210.0.19045.0< 10.0.19045.7548affected
MicrosoftWindows 11 Version 24H210.0.26100.0< 10.0.26100.8875affected
MicrosoftWindows 11 Version 25H210.0.26200.0< 10.0.26100.8875affected
MicrosoftWindows 11 version 26H110.0.28000.0< 10.0.28000.2525affected
MicrosoftWindows Server 20126.2.9200.0< 6.2.9200.26226affected
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0< 6.2.9200.26226affected
MicrosoftWindows Server 2012 R26.3.9600.0< 6.3.9600.23291affected
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0< 6.3.9600.23291affected
MicrosoftWindows Server 201610.0.14393.0< 10.0.14393.9339affected
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0< 10.0.14393.9339affected
MicrosoftWindows Server 201910.0.17763.0< 10.0.17763.9020affected
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0< 10.0.17763.9020affected
MicrosoftWindows Server 202210.0.20348.0< 10.0.20348.5386affected
MicrosoftWindows Server 202510.0.26100.0< 10.0.26100.33158affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0< 10.0.26100.33158affected
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I. Basic Information for CVE-2026-50647

Vulnerability Information
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Vulnerability Title
Active Directory Federation Server Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Active Directory Federation Services 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Active Directory Federation Services是美国Microsoft公司的一套提供身份验证和单点登录的服务。 Microsoft Active Directory Federation Services存在资源管理错误漏洞，该漏洞可能允许未经授权的攻击者通过网络拒绝服务。以下版本受到影响：Windows 10 Version 1607 10.0.14393.0之前版本、Windows 10 Version 1809 10.0.17763.0之前版本、Wind
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MicrosoftMicrosoft .NET Framework 3.5 3.5.0 ~ 2.0.50727.8983 & 3.0.30729.8978 -
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 4.7.0 ~ 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 -
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 4.8.0 ~ 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 -
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8.1 4.8.1 ~ 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 -
MicrosoftMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0 ~ 4.7.4143.0 -
MicrosoftMicrosoft .NET Framework 4.8 4.8.0 ~ 4.8.4803.0 -
MicrosoftWindows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.9339 -
MicrosoftWindows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.9020 -
MicrosoftWindows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.7548 -
MicrosoftWindows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.7548 -
MicrosoftWindows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8875 -
MicrosoftWindows 11 Version 25H2 10.0.26200.0 ~ 10.0.26100.8875 -
MicrosoftWindows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2525 -
MicrosoftWindows Server 2012 6.2.9200.0 ~ 6.2.9200.26226 -
MicrosoftWindows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.26226 -
MicrosoftWindows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.23291 -
MicrosoftWindows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.23291 -
MicrosoftWindows Server 2016 10.0.14393.0 ~ 10.0.14393.9339 -
MicrosoftWindows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.9339 -
MicrosoftWindows Server 2019 10.0.17763.0 ~ 10.0.17763.9020 -
MicrosoftWindows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.9020 -
MicrosoftWindows Server 2022 10.0.20348.0 ~ 10.0.20348.5386 -
MicrosoftWindows Server 2025 10.0.26100.0 ~ 10.0.26100.33158 -
MicrosoftWindows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.33158 -

II. Public POCs for CVE-2026-50647

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III. Intelligence Information for CVE-2026-50647

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Vendor Advisories for CVE-2026-50647 (1)

Same Patch Batch · Microsoft · 2026-07-14 · 570 CVEs total

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Showing top 20 of 570 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft .NET Framework 3.5
Same vendor: Microsoft
Same weakness: CWE-835

V. Comments for CVE-2026-50647

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