CVE-2026-50324ImportantRevised 21 Jul
Windows Active Directory Federation Services Denial of Service Vulnerability
Assessment
Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
- Severity
- Important
- CVSS base score
- 5.9CVSS:3.1/
AV:N/ AC:H/ PR:N/ UI:N/ S:U/ C:N/ I:N/ A:H/ E:U/ RL:O/ RC:C - Impact
- Denial of Service
- EPSS, next 30 days
- 0.9%Higher than 56.7% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Active Directory Federation Services (AD FS)
- Weakness
- CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
- Issued by
- Microsoft
- Published
- 14 Jul 2026 · July 2026
- Last revised
- 21 Jul 2026Updated product information in the Software Update table. This is an informational change only.
Updates that fix it
20 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5099444 | Monthly Rollup | Required | Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) | All CVEs in KB5099444 |
| KB5099535 | Security Update | Required | Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 and 5 more | All CVEs in KB5099535 |
| KB5099536 | Security Update | Required | Windows Server 2025, Windows Server 2025 (Server Core installation) | All CVEs in KB5099536 |
| KB5099538 | Security Update | Required | Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more | All CVEs in KB5099538 |
| KB5099540 | Security Update | Required | Windows Server 2022 | All CVEs in KB5099540 |
| KB5100989 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 and 1 more | All CVEs in KB5100989 |
| KB5100990 | Security Update | — | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation) | All CVEs in KB5100990 |
| KB5100991 | Security Update | — | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation) | All CVEs in KB5100991 |
| KB5100998 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems | All CVEs in KB5100998 |
| KB5101000 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems and 3 more | All CVEs in KB5101000 |
| KB5101001 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems | All CVEs in KB5101001 |
| KB5101002 | Security Update | — | Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems | All CVEs in KB5101002 |
| KB5101004 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems | All CVEs in KB5101004 |
| KB5101005 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation) | All CVEs in KB5101005 |
| KB5101006 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems and 3 more | All CVEs in KB5101006 |
| KB5101007 | Security Update | — | Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server 2016 and 1 more | All CVEs in KB5101007 |
| KB5101008 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 and 1 more | All CVEs in KB5101008 |
| KB5101009 | Security Update | — | Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) | All CVEs in KB5101009 |
| KB5101010 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation) | All CVEs in KB5101010 |
| KB5101011 | Security Update | — | Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) | All CVEs in KB5101011 |
Affected products
Developer Tools, ESU, Windows61 affected products
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)
- 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 2019 (Server Core installation)
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation)
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation)
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)
- Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
- Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
- Microsoft .NET Framework 4.8 on Windows Server 2012
- Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
- Microsoft .NET Framework 4.8 on Windows Server 2012 R2
- Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
- Microsoft .NET Framework 4.8 on Windows Server 2016
- Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
- Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems
- Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems
- 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 2012 R2
- Windows Server 2012 R2 (Server Core installation)
- Windows Server 2016
- Windows Server 2016 (Server Core installation)
- Windows Server 2019
- Windows Server 2019 (Server Core installation)
- Windows Server 2022
- Windows Server 2025
- Windows Server 2025 (Server Core installation)