CVE-2026-96222: high-severity vulnerability in Microsoft .NET Framework 3.5
Active Directory Federation Services (AD FS) Spoofing Vulnerability
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 0.6%
exploitation probability
0.6%top 53% of all CVEs
observed exploitation
nono source reports it
Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
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
Affected products
Microsoft · Microsoft .NET Framework 3.5Microsoft · Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2Microsoft · Microsoft .NET Framework 3.5 AND 4.8Microsoft · Microsoft .NET Framework 3.5 AND 4.8.1Microsoft · Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft · Microsoft .NET Framework 4.8Microsoft · Microsoft .NET Framework 4.8.1Microsoft · Microsoft Visual Studio 2022 version 17.14Microsoft · Microsoft Visual Studio 2026 version 18.10Microsoft · System.Security.Cryptography.XmlMicrosoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows Server 2012 R2Microsoft · Windows Server 2012 R2 (Server Core installation)Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)Related CVEs — Microsoft .NET Framework 3.5
In the same product, most dangerous first.
CVE-2020-0646CRITICALCVE-2020-0646EPSS 99.2%KEVCVE-2024-29059HIGH.NET Framework Information Disclosure VulnerabilityEPSS 98.6%KEVCVE-2020-1147HIGHCVE-2020-1147EPSS 94.0%KEVCVE-2023-36899HIGHASP.NET Elevation of Privilege VulnerabilityEPSS 76.7%CVE-2020-0605—CVE-2020-0605EPSS 17.8%CVE-2020-0606—CVE-2020-0606EPSS 17.2%