High

Active Directory Federation Services (AD FS) Spoofing Vulnerability

Type: advisorySource: Official CVE List1 source record

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

Announced 13 Oct 2026Source revision 1

Original source ↗

CVE-2026-96222

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-96222

Microsoft .NET Framework 3.5

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

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

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft .NET Framework 3.5 AND 4.7.2

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft .NET Framework 3.5 AND 4.8

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft .NET Framework 3.5 AND 4.8.1

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft .NET Framework 4.8

Source reference: /containers/cna/affected/6/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft .NET Framework 4.8.1

Source reference: /containers/cna/affected/7/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft Visual Studio 2022 version 17.14

Source reference: /containers/cna/affected/8/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Microsoft Visual Studio 2026 version 18.10

Source reference: /containers/cna/affected/9/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

System.Security.Cryptography.Xml

Source reference: /containers/cna/affected/10/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows 10 Version 1607

Source reference: /containers/cna/affected/11/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows 10 Version 1809

Source reference: /containers/cna/affected/12/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2012 R2

Source reference: /containers/cna/affected/13/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2012 R2 (Server Core installation)

Source reference: /containers/cna/affected/14/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2016

Source reference: /containers/cna/affected/15/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2016 (Server Core installation)

Source reference: /containers/cna/affected/16/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2019

Source reference: /containers/cna/affected/17/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2019 (Server Core installation)

Source reference: /containers/cna/affected/18/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2022

Source reference: /containers/cna/affected/19/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2025

Source reference: /containers/cna/affected/20/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Windows Server 2025 (Server Core installation)

Source reference: /containers/cna/affected/21/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 3.5",
    "versions": [
      {
        "status": "affected",
        "version": "3.5.0",
        "lessThan": "2.0.50727.9188 AND 3.0.30729.9171",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 11 version 26H1",
      "Windows Server 2012",
      "Windows Server 2012 R2"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 10 version 1607",
      "Windows Server 2016",
      "Windows Server 2019"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 3.5 AND 4.7.2",
    "versions": [
      {
        "status": "affected",
        "version": "4.7.0",
        "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 10 version 1809"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 3.5 AND 4.8",
    "versions": [
      {
        "status": "affected",
        "version": "4.8.0",
        "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 10 version 1809",
      "Windows 10 version 21H2",
      "Windows 10 version 22H2",
      "Windows Server 2019",
      "Windows Server 2022"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 3.5 AND 4.8.1",
    "versions": [
      {
        "status": "affected",
        "version": "4.8.1",
        "lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 10 version 21H2",
      "Windows 10 version 22H2",
      "Windows 11 version 23H2",
      "Windows 11 version 24H2",
      "Windows 11 version 25H2",
      "Windows 11 version 26H2",
      "Windows Server 2022",
      "Windows Server 2025"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
    "versions": [
      {
        "status": "affected",
        "version": "4.7.0",
        "lessThan": "4.7.4150.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows Server 2012",
      "Windows Server 2012 R2"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 4.8",
    "versions": [
      {
        "status": "affected",
        "version": "4.8.0",
        "lessThan": "4.8.4811.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 10 version 1607",
      "Windows Server 2012",
      "Windows Server 2012 R2",
      "Windows Server 2016"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft .NET Framework 4.8.1",
    "versions": [
      {
        "status": "affected",
        "version": "4.8.0.0",
        "lessThan": "4.8.9363.0",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "Windows 11 version 26H1"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft Visual Studio 2022 version 17.14",
    "versions": [
      {
        "status": "affected",
        "version": "17.14.0",
        "lessThan": "17.14.42",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft Visual Studio 2026 version 18.10",
    "versions": [
      {
        "status": "affected",
        "version": "18.10.0",
        "lessThan": "18.10.4",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "System.Security.Cryptography.Xml",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.0",
        "lessThan": "8.0.5",
        "versionType": "custom"
      }
    ],
    "platforms": [
      ".NET 8.0 runtime installed on Linux",
      ".NET 8.0 runtime installed on Mac OS",
      ".NET 8.0 runtime installed on Windows"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 10 Version 1607",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.14393.0",
        "lessThan": "10.0.14393.9612",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "32-bit Systems",
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows 10 Version 1809",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.17763.0",
        "lessThan": "10.0.17763.9376",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "32-bit Systems",
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2012 R2",
    "versions": [
      {
        "status": "affected",
        "version": "6.3.9600.0",
        "lessThan": "6.3.9600.23470",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2012 R2 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "6.3.9600.0",
        "lessThan": "6.3.9600.23470",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2016",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.14393.0",
        "lessThan": "10.0.14393.9612",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2016 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.14393.0",
        "lessThan": "10.0.14393.9612",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2019",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.17763.0",
        "lessThan": "10.0.17763.9376",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2019 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.17763.0",
        "lessThan": "10.0.17763.9376",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2022",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.20348.0",
        "lessThan": "10.0.20348.5761",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2025",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.33650",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2025 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.33650",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  }
]

Related CVEs: CVE-2026-96222
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #54875 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 15:26:51 GMT
Publisher date: Tue, 13 Oct 2026 19:00:31 GMT

Read the original announcement