high7.4
CVE-2026-96222
Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Impact
Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | System.Security.Cryptography.Xml | >= 8.0.0, <= 8.0.4 | 8.0.5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Microsoft .NET Framework 4.8.1 | from 4.8.0.0 before 4.8.9363.0 |
| Microsoft | System.Security.Cryptography.Xml | from 10.0.0 before 8.0.5 |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | from 4.7.0 before 4.7.4150.0 |
| Microsoft | Windows Server 2025 (Server Core Installation) | from 10.0.26100.0 before 10.0.26100.33650 |
| Microsoft | Windows Server 2012 R2 | from 6.3.9600.0 before 6.3.9600.23470 |
| Microsoft | Windows Server 2016 | from 10.0.14393.0 before 10.0.14393.9612 |
| Microsoft | Windows Server 2016 (Server Core Installation) | from 10.0.14393.0 before 10.0.14393.9612 |
| Microsoft | Windows Server 2019 (Server Core Installation) | from 10.0.17763.0 before 10.0.17763.9376 |
| Microsoft | Microsoft .NET Framework 4.8 | from 4.8.0 before 4.8.4811.0 |
| Microsoft | Microsoft Visual Studio 2022 Version 17.14 | from 17.14.0 before 17.14.42 |
| Microsoft | Windows Server 2019 | from 10.0.17763.0 before 10.0.17763.9376 |
| Microsoft | Windows Server 2022 | from 10.0.20348.0 before 10.0.20348.5761 |
| Microsoft | Windows 10 1607 | before 10.0.14393.9612 |
| Microsoft | Windows 10 1809 | before 10.0.17763.9376 |
| Microsoft | Windows Server 2012 | All versions Version r2 |
| Microsoft | Windows Server 2016 | before 10.0.14393.9612 |
| Microsoft | Windows Server 2019 | before 10.0.17763.9376 |
| Microsoft | Windows Server 2022 | before 10.0.20348.5761 |
| Microsoft | Windows Server 2025 | before 10.0.26100.33650 |
| Microsoft | .Net | from 8.0.0 before 8.0.5 |
| Microsoft | Visual Studio 2022 | from 17.14.0 before 17.14.42 |
| Microsoft | Visual Studio 2026 | from 18.10.0 before 18.10.4 |
| Microsoft | .Net Framework | Versions 4.8.1, 4.8, 4.6.2, 4.7, 4.7.1, 4.7.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-vrv5-2jg9-4mmr
- https://github.com/dotnet/runtime/security/advisories/GHSA-vrv5-2jg9-4mmr
- https://github.com/dotnet/announcements/issues/474
- https://github.com/dotnet/runtime/issues/135705
- https://nvd.nist.gov/vuln/detail/CVE-2026-96222
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96222