MicrosoftRadar Independent status for Microsoft services

Smartcard authentication issues might occur with the October 2025 Windows update

Microsoft lists this known issue for 9 Windows versions; its status is Resolved. It started with KB5066586, KB5066782, KB5066791 and 4 more updates.

Resolved1 version

Facts

Microsoft id
3697
Status
Resolved
Products
Windows 10, version 1607, Windows 10, version 1809, Windows 10, version 22H2, Windows 11, version 22H2, Windows 11, version 23H2, Windows 11, version 24H2, Windows 11, version 25H2, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2025, Windows Server 23H2
Versions
9 entries
  • Windows 10, version 1607 and Windows Server 2016
  • Windows 10, version 1809 and Windows Server 2019
  • Windows 10, version 22H2
  • Windows 11, version 23H2
  • Windows 11, version 24H2
  • Windows 11, version 25H2
  • Windows Server 2012 R2
  • Windows Server 2022
  • Windows Server 2025
Originating KBs
KB5066586, KB5066782, KB5066791, KB5066793, KB5066794, KB5066835, KB5066836
First captured by us
(from our first import of this list)
Microsoft last modified
Source
Windows known issues · open the original at Microsoft

Status per Windows version

VersionStatusOriginating updateOpenedResolved
Windows 11, version 25H2ResolvedOS Build 26200.6899, KB5066835, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows 11, version 24H2ResolvedOS Build 26100.6899, KB5066835, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows 11, version 23H2ResolvedOS Build 22621.6060, KB5066793, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows Server 2025ResolvedOS Build 26100.6899, KB5066835, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows Server 2022ResolvedOS Build 20348.4294, KB5066782, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows 10, version 22H2ResolvedOS Build 19045.6456, KB5066791, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows 10, version 1809 and Windows Server 2019ResolvedOS Build 17763.7919, KB5066586, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows 10, version 1607 and Windows Server 2016ResolvedOS Build 14393.8519, KB5066836, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC
Windows Server 2012 R2ResolvedKB5066794, 2025-10-142025-10-18 03:06 UTC2025-10-23 00:31 UTC

Microsoft says

Smart card authentication and other certificate operations might intentionally fail after installing Windows Updates released on or after October 14, 2025 (KB5066835) that contain protections…

Windows known issues,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    As first seen: Resolved
    Status
    Resolved

    Seen by us · Microsoft's timestamp · Microsoft's page

Mentioning the same Microsoft ids

Last updated