Security News > 2022 > May > Microsoft: May Windows updates cause AD authentication failures
Microsoft is investigating a known issue causing authentication failures for some Windows services after installing updates released during the May 2022 Patch Tuesday.
Microsoft says the known issue is only triggered after installing the updates on servers used as domain controllers.
The updates will not negatively impact when deployed on client Windows devices and non-domain controller Windows Servers.
"After installing updates released May 10, 2022 on your domain controllers, you might see authentication failures on the server or client for services such as Network Policy Server, Routing and Remote access Service, Radius, Extensible Authentication Protocol, and Protected Extensible Authentication Protocol," Microsoft explains.
Microsoft explains in a separate support document that these ongoing service authentication problems are caused by security updates addressing CVE-2022-26931 and CVE-2022-26923, two elevations of privilege vulnerabilities in Windows Kerberos and Active Directory Domain Services.
In November, Microsoft also addressed Windows Server authentication failures related to Kerberos delegation scenarios impacting Domain Controllers via out-of-band updates.
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Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2022-05-10 | CVE-2022-26931 | Unspecified vulnerability in Microsoft products Windows Kerberos Elevation of Privilege Vulnerability | 7.5 |
| 2022-05-10 | CVE-2022-26923 | Improper Certificate Validation vulnerability in Microsoft products Active Directory Domain Services Elevation of Privilege Vulnerability | 8.8 |