Active Directory Federation Services (AD FS) Spoofing Vulnerability
CVE-2026-96222

7.4HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft .net Framework 3.5
Microsoft .net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2
Microsoft .net Framework 3.5 And 4.7.2
Microsoft .net Framework 3.5 And 4.8
Vendor
CVE Published:
13 October 2026

What is CVE-2026-96222?

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

Affected Version(s)

Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 Windows 10 version 1607 3.0.0.0 < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0

Microsoft .NET Framework 3.5 AND 4.7.2 Windows 10 version 1809 4.7.0 < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0

Microsoft .NET Framework 3.5 AND 4.8 Windows 10 version 1809 4.8.0 < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.