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Recorded 14 Oct 2026 at 11:22 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

CVEMicrosoft Security Response Center

Active Directory Federation Services (AD FS) Spoofing Vulnerability

Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

Permanent link to this revision

What it said

CVE
CVE-2026-96222
Severity
Critical
CVSS base score
7.4
CVSS vector
CVSS: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
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Component
Active Directory Federation Services (AD FS)
Weakness
CWE-295: Improper Certificate Validation
Issued by
Microsoft
Customer action
Required: apply the update
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)
Updates that fix it
KB5126646: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5126651: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation) (restart required); KB5126655: Windows Server 2022, Windows Server 2022 (Server Core installation) (restart required); KB5126836: Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) (restart required); KB5126868: 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, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation) (restart required); KB5127660: Microsoft .NET Framework 3.5 on Windows Server 2012; KB5127664: Microsoft .NET Framework 3.5 on Windows Server 2012 R2; KB5127666: 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; KB5127667: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012; KB5127668: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2; KB5127683: 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; KB5127684: Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016; KB5127685: 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; KB5127686: Microsoft .NET Framework 4.8 on Windows Server 2012; KB5127687: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022; KB5127688: Microsoft .NET Framework 4.8 on Windows Server 2012 R2; KB5127689: 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; KB5127690: 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; KB5127691: Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1; KB5127692: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2; KB5127693: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022; KB5127694: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2; KB5127696: Microsoft .NET Framework 3.5 on Windows 11 version 26H1
CISA KEV
Not listed in the collected catalog
EPSS
Not scored
Public exploit code
No Nuclei template listed
Published
13 Oct 2026 07:00 UTC
Last revised
13 Oct 2026 07:00 UTC
Revision note
Information published.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 14 Oct 2026 at 11:21 UTC
CISA KEV
Complete at observationRead 14 Oct 2026 at 11:21 UTC
FIRST EPSS
Complete at observationRead 14 Oct 2026 at 11:21 UTC
Public exploit code
Complete at observationRead 14 Oct 2026 at 11:21 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

ChangeIntel

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Sources read 14 Oct 18:00 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current

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