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High severity · published Oct 13, 2026
CVE-2026-96222
Active Directory Federation Services (AD FS) Spoofing Vulnerability
7.4
CVSS
0.6%
EPSS
No
On KEV
Description
Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MN
Microsoft .NET Framework 3.5 · Microsoft
3.5.0 before 2.0.50727.9188 AND 3.0.30729.9171 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.7.2 · Microsoft
4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8 · Microsoft
4.8.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8.1 · Microsoft
4.8.1 before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 · source: vendor
MN
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
4.7.0 before 4.7.4150.0 · source: vendor
MN
Microsoft .NET Framework 4.8 · Microsoft
4.8.0 before 4.8.4811.0 · source: vendor
MN
Microsoft .NET Framework 4.8.1 · Microsoft
4.8.0.0 before 4.8.9363.0 · source: vendor
MV
Microsoft Visual Studio 2022 version 17.14 · Microsoft
17.14.0 before 17.14.42 · source: vendor
MV
Microsoft Visual Studio 2026 version 18.10 · Microsoft
18.10.0 before 18.10.4 · source: vendor
SY
System.Security.Cryptography.Xml · Microsoft
10.0.0 before 8.0.5 · source: vendor
W1
Windows 10 Version 1607 · Microsoft
10.0.14393.0 before 10.0.14393.9612 · source: vendor
Affected product
MN
Microsoft .NET Framework 3.5
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-96222
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-96222
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96222
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