CVE-2026-96222

Active Directory Federation Services (AD FS) Spoofing Vulnerability

Published Oct 13, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed

Description

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

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Microsoft .NET Framework 3.5

affected

Version	Status	Constraints
`3.5.0`	affected	< 2.0.50727.9188 AND 3.0.30729.9171

Microsoft

Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2

affected

Version	Status	Constraints
`3.0.0.0`	affected	< 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.7.2

affected

Version	Status	Constraints
`4.7.0`	affected	< 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.8

affected

Version	Status	Constraints
`4.8.0`	affected	< 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0

Microsoft

Microsoft .NET Framework 3.5 AND 4.8.1

affected

Version	Status	Constraints
`4.8.1`	affected	< 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0

Microsoft

Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

affected

Version	Status	Constraints
`4.7.0`	affected	< 4.7.4150.0

Microsoft

Microsoft .NET Framework 4.8

affected

Version	Status	Constraints
`4.8.0`	affected	< 4.8.4811.0

Microsoft

Microsoft .NET Framework 4.8.1

affected

Version	Status	Constraints
`4.8.0.0`	affected	< 4.8.9363.0

Microsoft

Microsoft Visual Studio 2022 version 17.14

affected

Version	Status	Constraints
`17.14.0`	affected	< 17.14.42

Microsoft

Microsoft Visual Studio 2026 version 18.10

affected

Version	Status	Constraints
`18.10.0`	affected	< 18.10.4

Microsoft

System.Security.Cryptography.Xml

affected

Version	Status	Constraints
`10.0.0`	affected	< 8.0.5

Microsoft

Windows 10 Version 1607

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9612

Microsoft

Windows 10 Version 1809

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.9376

Microsoft

Windows Server 2012 R2

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23470

Microsoft

Windows Server 2012 R2 (Server Core installation)

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23470

Microsoft

Windows Server 2016

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9612

Microsoft

Windows Server 2016 (Server Core installation)

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9612

Microsoft

Windows Server 2019

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.9376

Microsoft

Windows Server 2019 (Server Core installation)

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.9376

Microsoft

Windows Server 2022

affected

Version	Status	Constraints
`10.0.20348.0`	affected	< 10.0.20348.5761

Microsoft

Windows Server 2025

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.33650

Microsoft

Windows Server 2025 (Server Core installation)

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.33650

Configuration 1 [-]

OR	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2019:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2022:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*

Configuration 2 [-]

AND

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

OR	cpe:2.3:o:apple:macos:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*
	cpe:2.3:o:microsoft:windows:-:::::::*

Configuration 3 [-]

OR	cpe:2.3:a:microsoft:visual_studio_2022::::::-::*
	cpe:2.3:a:microsoft:visual_studio_2026::::::-::*

Configuration 4 [-]

AND

cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_11_26h1:-::::::arm64:
	cpe:2.3:o:microsoft:windows_11_26h1:-::::::x64:

Configuration 5 [-]

AND

cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_10_1607:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

Configuration 6 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*

OR	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration 7 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.8:::::::*

OR	cpe:2.3:o:microsoft:windows_10_1809:-:::::::*
	cpe:2.3:o:microsoft:windows_10_21h2:-:::::::*
	cpe:2.3:o:microsoft:windows_10_22h2:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*

Configuration 8 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.8.1:::::::*

OR	cpe:2.3:o:microsoft:windows_10_21h2:-:::::::*
	cpe:2.3:o:microsoft:windows_10_22h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_23h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_24h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_25h2:-:::::::*
	cpe:2.3:o:microsoft:windows_11_26h2:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2025:-:::::::*

Configuration 9 [-]

AND

OR	cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*

OR	cpe:2.3:o:microsoft:windows_10_1607:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

Configuration 10 [-]

AND

cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_11_26h1:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

No data.

Vendor Product Versions

Microsoft

.net

Version	Status	Scheme	Platform
`[0,*]`	affected	generic	—

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[3.5.0,2.0.50727.9188)`	affected	generic	['windows_11_version_26h1', 'windows_server_2012', 'windows_server_2012_r2']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[3.0.0.0,2.0.50727.8987)`	affected	generic	['windows_10_version_1607', 'windows_server_2016', 'windows_server_2019']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.7.0,2.0.50727.9073)`	affected	generic	['windows_10_version_1809']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.0,2.0.50727.9073)`	affected	generic	['windows_10_version_1809', 'windows_10_version_21h2', 'windows_10_version_22h2', 'windows_server_2019', 'windows_server_2022']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.1,2.0.50727.9188)`	affected	generic	['windows_10_version_21h2', 'windows_10_version_22h2', 'windows_11_version_23h2', 'windows_11_version_24h2', 'windows_11_version_25h2', 'windows_11_version_26h1', 'windows_server_2022', 'windows_server_2025']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.7.0,4.7.4150.0)`	affected	generic	['windows_server_2012', 'windows_server_2012_r2']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.0,4.8.4811.0)`	affected	generic	['windows_10_version_1607', 'windows_server_2012', 'windows_server_2012_r2', 'windows_server_2016']

Microsoft

.net Framework

Version	Status	Scheme	Platform
`[4.8.0.0,4.8.9363.0)`	affected	generic	['windows_11_version_26h1']

Microsoft

Microsoft Visual Studio 2026 Version 18.10

Version	Status	Scheme	Platform
`[18.10.0,18.10.4)`	affected	semver	—

Microsoft

System.security.cryptography.xml

Version	Status	Scheme	Platform
`[10.0.0,8.0.5)`	affected	semver	['.net_8.0_runtime_installed_on_linux', '.net_8.0_runtime_installed_on_mac_os', '.net_8.0_runtime_installed_on_windows']

Microsoft

Visual Studio 2022

Version	Status	Scheme	Platform
`[17.14.0,17.14.42)`	affected	semver	—

Microsoft

Visual Studio 2026

Version	Status	Scheme	Platform
`[18.10.0,18.10.4)`	affected	semver	—

Microsoft

Windows 10 1607

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9612)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows 10 1809

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.9376)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows Server 2012 R2

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23470)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2 (server Core Installation)

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23470)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9612)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016 (server Core Installation)

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9612)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2019

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.9376)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2019 (server Core Installation)

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.9376)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2022

Version	Status	Scheme	Platform
`[10.0.20348.0,10.0.20348.5761)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2025

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.33650)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2025 (server Core Installation)

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.33650)`	affected	generic	['x64-based_systems']

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Github GHSA	GHSA-vrv5-2jg9-4mmr	Microsoft Security Advisory CVE-2026-96222 - .NET Spoofing Vulnerability

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.586% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96222
https://nvd.nist.gov/vuln/detail/CVE-2026-96222
https://www.cve.org/CVERecord?id=CVE-2026-96222

History

Oct 25, 2026 11:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation) Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2025 (server Core Installation)
Vendors & Products		Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation) Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2025 (server Core Installation)

Oct 20, 2026 12:45 AM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Apple Apple macos Linux Linux linux Kernel Microsoft visual Studio 2026 Microsoft windows Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows 11 26h2 Microsoft windows Server 2012
CPEs		cpe:2.3:a:microsoft:.net_framework:3.5:::::::* cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::* cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::* cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::* cpe:2.3:a:microsoft:.net_framework:4.7:::::::* cpe:2.3:a:microsoft:.net_framework:4.8.1:::::::* cpe:2.3:a:microsoft:.net_framework:4.8:::::::* cpe:2.3:a:microsoft:visual_studio_2022::::::-::* cpe:2.3:a:microsoft:visual_studio_2026::::::-::* cpe:2.3:o:apple:macos:-:::::::* cpe:2.3:o:linux:linux_kernel:-:::::::* cpe:2.3:o:microsoft:windows:-:::::::* cpe:2.3:o:microsoft:windows_10_1607:::::::x64:* cpe:2.3:o:microsoft:windows_10_1607:-:::::::* cpe:2.3:o:microsoft:windows_10_1809:::::::x64:* cpe:2.3:o:microsoft:windows_10_1809:-:::::::* cpe:2.3:o:microsoft:windows_10_21h2:-:::::::* cpe:2.3:o:microsoft:windows_10_22h2:-:::::::* cpe:2.3:o:microsoft:windows_11_23h2:-:::::::* cpe:2.3:o:microsoft:windows_11_24h2:-:::::::* cpe:2.3:o:microsoft:windows_11_25h2:-:::::::* cpe:2.3:o:microsoft:windows_11_26h1:-:::::::* cpe:2.3:o:microsoft:windows_11_26h1:-::::::arm64: cpe:2.3:o:microsoft:windows_11_26h1:-::::::x64: cpe:2.3:o:microsoft:windows_11_26h2:-:::::::* cpe:2.3:o:microsoft:windows_server_2012:-:::::::* cpe:2.3:o:microsoft:windows_server_2012:r2:::::::* cpe:2.3:o:microsoft:windows_server_2016:::::::x64:* cpe:2.3:o:microsoft:windows_server_2016:-:::::::* cpe:2.3:o:microsoft:windows_server_2019:::::::x64:* cpe:2.3:o:microsoft:windows_server_2019:-:::::::* cpe:2.3:o:microsoft:windows_server_2022:::::::x64:* cpe:2.3:o:microsoft:windows_server_2022:-:::::::* cpe:2.3:o:microsoft:windows_server_2025:::::::x64:* cpe:2.3:o:microsoft:windows_server_2025:-:::::::*
Vendors & Products		Apple Apple macos Linux Linux linux Kernel Microsoft visual Studio 2026 Microsoft windows Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows 11 26h2 Microsoft windows Server 2012

Oct 16, 2026 12:30 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-96222 https://www.cve.org/CVERecord?id=CVE-2026-96222
Metrics	threat_severity `None`	threat_severity `Important`

Oct 14, 2026 5:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Oct 13, 2026 7:15 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Title		Active Directory Federation Services (AD FS) Spoofing Vulnerability
First Time appeared		Microsoft Microsoft .net Microsoft .net Framework Microsoft microsoft Visual Studio 2026 Version 18.10 Microsoft system.security.cryptography.xml Microsoft visual Studio 2022 Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
Weaknesses		CWE-295
CPEs		cpe:2.3:a:microsoft:.net:::::::: cpe:2.3:a:microsoft:.net_framework:::::::: cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.10:::::::: cpe:2.3:a:microsoft:system.security.cryptography.xml:::::::: cpe:2.3:a:microsoft:visual_studio_2022:::::::: cpe:2.3:o:microsoft:windows_10_1607:::::::x86:* cpe:2.3:o:microsoft:windows_10_1809:::::::x86:* cpe:2.3:o:microsoft:windows_server_2012_R2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2016:::::::: cpe:2.3:o:microsoft:windows_server_2019:::::::: cpe:2.3:o:microsoft:windows_server_2022:::::::: cpe:2.3:o:microsoft:windows_server_2025::::::::
Vendors & Products		Microsoft Microsoft .net Microsoft .net Framework Microsoft microsoft Visual Studio 2026 Version 18.10 Microsoft system.security.cryptography.xml Microsoft visual Studio 2022 Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96222
Metrics		cvssV3_1 `{'score': 7.4, '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'}`

Subscriptions

Apple Macos

Linux Linux Kernel

Microsoft .net .net Framework Microsoft Visual Studio 2026 Version 18.10 System.security.cryptography.xml Visual Studio 2022 Visual Studio 2026 Windows Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h2 Windows Server 2012 Windows Server 2012 R2 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)

Weaknesses