CVE-2026-50647— Active Directory Federation Server Denial of Service Vulnerability
Quick assessment
Affected
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 24
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 | 4.7.0< 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 |
affected |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 | 4.8.0< 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 |
affected |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 | 4.8.1< 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 |
affected |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | 4.7.0< 4.7.4143.0 |
affected |
| Microsoft | Microsoft .NET Framework 4.8 | 4.8.0< 4.8.4803.0 |
affected |
| Microsoft | Microsoft .NET Framework 4.8.1 | 4.8.0.0< 4.8.9340.0 |
affected |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0< 10.0.14393.9339 |
affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0< 10.0.17763.9020 |
affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0< 10.0.19044.7548 |
affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0< 10.0.19045.7548 |
affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0< 10.0.26100.8875 |
affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0< 10.0.26200.8875 |
affected |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0< 10.0.28000.2525 |
affected |
| Microsoft | Windows Server 2012 | 6.2.9200.0< 6.2.9200.26226 |
affected |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0< 6.2.9200.26226 |
affected |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0< 6.3.9600.23291 |
affected |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0< 6.3.9600.23291 |
affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0< 10.0.14393.9339 |
affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0< 10.0.14393.9339 |
affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0< 10.0.17763.9020 |
affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0< 10.0.17763.9020 |
affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0< 10.0.20348.5386 |
affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0< 10.0.26100.33158 |
affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0< 10.0.26100.33158 |
affected |
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
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
II. Public POCs for CVE-2026-50647
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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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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V. Comments for CVE-2026-50647
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