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Remote Desktop Services might stop responding after Sept. 2026 security update

Microsoft lists this known issue for 12 Windows versions; its status is Resolved. It started with KB5122871, KB5122876, KB5122878 and 7 more updates. Microsoft resolved it in KB5129194, KB5129195, KB5129235 and 7 more updates.

Resolved1 version

Facts

Microsoft id
4981
Status
Resolved
Products
Windows 10 Enterprise LTSC 2016, Windows 10 Enterprise LTSC 2019, Windows 10 Enterprise LTSC 2021, Windows 10, version 1607, Windows 10, version 1809, Windows 10, version 21H2, Windows 10, version 22H2, Windows 11, version 23H2, Windows 11, version 24H2, Windows 11, version 25H2, Windows 11, version 26H1, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2025
Versions
12 entries
  • Windows 10 Enterprise LTSC 2021
  • 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 11, version 26H1
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2022
  • Windows Server 2025
Originating KBs
10 entries
  • KB5122871
  • KB5122876
  • KB5122878
  • KB5122880
  • KB5122882
  • KB5123065
  • KB5123066
  • KB5123099
  • KB5124008
  • KB5124012
Resolved by
10 entries
  • KB5129194
  • KB5129195
  • KB5129235
  • KB5129236
  • KB5129237
  • KB5129238
  • KB5129239
  • KB5129242
  • KB5129243
  • KB5129244
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 26H1Resolved KB5129194OS Build 28000.2954, KB5124012, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 11, version 25H2Resolved KB5129195OS Build 26200.9445, KB5124008, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 11, version 24H2Resolved KB5129195OS Build 26100.9445, KB5124008, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 11, version 23H2Resolved KB5129242OS Build 22621.7582, KB5122880, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows Server 2025Resolved KB5129235OS Build 26100.33438, KB5122871, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows Server 2022Resolved KB5129237OS Build 20348.5622, KB5122882, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 10, version 22H2Resolved KB5129236OS Build 19045.7725, KB5122878, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 10 Enterprise LTSC 2021Resolved KB5129236OS Build 19044.7725, KB5122878, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 10, version 1809 and Windows Server 2019Resolved KB5129238OS Build 17763.9245, KB5122876, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows 10, version 1607 and Windows Server 2016Resolved KB5129239OS Build 14393.9512, KB5123099, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows Server 2012 R2Resolved KB5129243KB5123066, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC
Windows Server 2012Resolved KB5129244KB5123065, 2026-09-082026-09-11 18:19 UTC2026-09-14 17:00 UTC

Microsoft says

After installing the September 2026 Windows security update (KB5124012), some organizations might experience issues with Remote Desktop Services (RDS).

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