CVE-2026-96222CriticalSpoofingNetwork
Active Directory Federation Services (AD FS) Spoofing Vulnerability
Assessment
Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
- Severity
- Critical
- CVSS base score
- 7.4CVSS:3.1/
AV:N/ AC:H/ PR:N/ UI:N/ S:U/ C:H/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Spoofing
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Active Directory Federation Services (AD FS)
- Weakness
- CWE-295: Improper Certificate Validation
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- NetworkAV:N
- Attack complexity
- HighAC:H
- Privileges required
- NonePR:N
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- HighC:H
- Integrity
- HighI:H
- Availability
- NoneA:N
Updates that fix it
23 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5126646 | Security Update | Required | Windows Server 2025, Windows Server 2025 (Server Core installation) | All CVEs in KB5126646 |
| KB5126651 | 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 KB5126651 |
| KB5126655 | Security Update | Required | Windows Server 2022, Windows Server 2022 (Server Core installation) | All CVEs in KB5126655 |
| KB5126836 | Security Update | Required | Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) | All CVEs in KB5126836 |
| KB5126868 | Security Update | Required | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016, Windows 10 Version 1607 for 32-bit Systems and 3 more | All CVEs in KB5126868 |
| KB5127660 | Security Update | — | Microsoft .NET Framework 3.5 on Windows Server 2012 | All CVEs in KB5127660 |
| KB5127664 | Security Update | — | Microsoft .NET Framework 3.5 on Windows Server 2012 R2 | All CVEs in KB5127664 |
| KB5127666 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 | All CVEs in KB5127666 |
| KB5127667 | Security Update | — | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 | All CVEs in KB5127667 |
| KB5127668 | Security Update | — | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 | All CVEs in KB5127668 |
| KB5127683 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 | All CVEs in KB5127683 |
| KB5127684 | Security Update | — | Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016 | All CVEs in KB5127684 |
| KB5127685 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | All CVEs in KB5127685 |
| KB5127686 | Security Update | — | Microsoft .NET Framework 4.8 on Windows Server 2012 | All CVEs in KB5127686 |
| KB5127687 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 | All CVEs in KB5127687 |
| KB5127688 | Security Update | — | Microsoft .NET Framework 4.8 on Windows Server 2012 R2 | All CVEs in KB5127688 |
| KB5127689 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 | All CVEs in KB5127689 |
| KB5127690 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 | All CVEs in KB5127690 |
| KB5127691 | Security Update | — | Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 | All CVEs in KB5127691 |
| KB5127692 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2 | All CVEs in KB5127692 |
| KB5127693 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 | All CVEs in KB5127693 |
| KB5127694 | Security Update | — | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2 | All CVEs in KB5127694 |
| KB5127696 | Security Update | — | Microsoft .NET Framework 3.5 on Windows 11 version 26H1 | All CVEs in KB5127696 |
Affected products
Developer Tools, ESU, Other, Windows46 affected products
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2
- Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2
- 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 2025
- Microsoft .NET Framework 3.5 on Windows 11 version 26H1
- Microsoft .NET Framework 3.5 on Windows Server 2012
- Microsoft .NET Framework 3.5 on Windows Server 2012 R2
- 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 R2
- Microsoft .NET Framework 4.8 on Windows 10 version 1607
- Microsoft .NET Framework 4.8 on Windows Server 2012
- Microsoft .NET Framework 4.8 on Windows Server 2012 R2
- Microsoft .NET Framework 4.8 on Windows Server 2016
- Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1
- Microsoft Visual Studio 2022 version 17.14
- Microsoft Visual Studio 2026 version 18.10
- System.Security.Cryptography.Xml on .NET 8.0 installed on Linux
- System.Security.Cryptography.Xml on .NET 8.0 installed on Mac OS
- System.Security.Cryptography.Xml on .NET 8.0 installed on Windows
- 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 2022 (Server Core installation)
- Windows Server 2025
- Windows Server 2025 (Server Core installation)
What changed
First observed 14 Oct 2026No field changes in the recorded history.
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