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Recorded 29 Oct 2026 at 20:19 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

Windows updateMicrosoft release information, MSRC and Windows release health

KB5066835

Windows 11, version 24H2: KB5066835 · 2025-10 B · OS build 26100.6899

What it said

KB
KB5066835
Windows versions and builds
Windows 11, version 24H2: 26100.6899 (2025-10 B); Windows 11, version 25H2: 26200.6899 (2025-10 B); Windows Server 2025: 26100.6899 (2025-10 B)
Applies to
Windows 11, version 24H2, Windows 11, version 25H2, Windows Server 2025
Restart required
Not stated in collected security fixes
CVEs fixed
Unknown: security evidence or the required release is incomplete
Known issues affecting this update
None in the collected release health data
Known issues resolved
None in the collected release health data
Included security update
None identified in the collected release tables
CVEs listed directly for this KB
Unknown: security evidence or the required release is incomplete
Missing security release
October 2025
Published
14 Oct 2025 00:00 UTC
Known issues caused
None in the collected release health data

Source evidence when recorded

Windows 11 releases
Complete at observationRead 29 Oct 2026 at 20:17 UTC
Windows Server releases
Complete at observationRead 29 Oct 2026 at 20:17 UTC
Microsoft security releases
Complete at observationRead 29 Oct 2026 at 20:17 UTC
Windows known issues
Complete at observationRead 29 Oct 2026 at 20:17 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. Known issues: None in the collected release health data
  2. Applies to: Windows Server 2025 → Windows 11, version 24H2, Windows 11, version 25H2, Windows Server 2025
  3. Applies to: Windows 11, version 24H2, Windows 11, version 25H2, Windows Server 2025 → Windows Server 2025
  4. Issues resolved: Unknown: known-issue evidence is incomplete or retained → None in the collected release health data · Known issues: Unknown: known-issue evidence is incomplete or retained → None in the collected release health data
  5. Issues resolved: None in the collected release health data → Unknown: known-issue evidence is incomplete or retained · Known issues: None in the collected release health data → Unknown: known-issue evidence is incomplete or retained
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (26)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 29 Oct 2026 · 20:19:26 UTC Known issues affecting this updateNone in the collected release health data
  2. 28 Oct 2026 · 13:54:09 UTC Source coverage: windows-server-releasesIncomplete → Current
  3. 28 Oct 2026 · 08:37:56 UTC Applies toWindows Server 2025 → Windows 11, version 24H2, Windows 11, version 25H2, Windows Server 2025
  4. 28 Oct 2026 · 08:37:56 UTC Windows versions and buildsWindows Server 2025: 26100.6899 (2025-10 B) → Windows 11, version 24H2: 26100.6899 (2025-10 B); Windows 11, version 25H2: 26200.6899 (2025-10 B); Windows Server 2025: 26100.6899 (2025-10 B)
  5. 28 Oct 2026 · 08:37:56 UTC Source coverage: windows-server-releasesCurrent → Incomplete
  6. 28 Oct 2026 · 08:37:56 UTC Source coverage: windows-11-releasesCurrent
  7. 28 Oct 2026 · 08:37:56 UTC Link: Support articlehttps://support.microsoft.com/topic/october-14-2025-kb5066835-os-build-26100-6899-6cdcc1c3-cfbf-41a3-8f0d-0c4a9d2b7d1e → https://support.microsoft.com/help/5066835
  8. 28 Oct 2026 · 08:37:56 UTC SummaryWindows Server 2025: KB5066835 · 2025-10 B · OS build 26100.6899 → Windows 11, version 24H2: KB5066835 · 2025-10 B · OS build 26100.6899
  9. 26 Oct 2026 · 06:24:14 UTC Applies toWindows 11, version 24H2, Windows 11, version 25H2, Windows Server 2025 → Windows Server 2025
  10. 26 Oct 2026 · 06:24:14 UTC Windows versions and buildsWindows 11, version 24H2: 26100.6899 (2025-10 B); Windows 11, version 25H2: 26200.6899 (2025-10 B); Windows Server 2025: 26100.6899 (2025-10 B) → Windows Server 2025: 26100.6899 (2025-10 B)
  11. 26 Oct 2026 · 06:24:14 UTC Source coverage: windows-11-releasesCurrent → Not collected
  12. 26 Oct 2026 · 06:24:14 UTC Link: Support articlehttps://support.microsoft.com/help/5066835 → https://support.microsoft.com/topic/october-14-2025-kb5066835-os-build-26100-6899-6cdcc1c3-cfbf-41a3-8f0d-0c4a9d2b7d1e
  13. 26 Oct 2026 · 06:24:14 UTC SummaryWindows 11, version 24H2: KB5066835 · 2025-10 B · OS build 26100.6899 → Windows Server 2025: KB5066835 · 2025-10 B · OS build 26100.6899
  14. 23 Oct 2026 · 09:33:49 UTC Known issues resolvedUnknown: known-issue evidence is incomplete or retained → None in the collected release health data
  15. 23 Oct 2026 · 09:33:49 UTC Known issues causedUnknown: known-issue evidence is incomplete or retained → None in the collected release health data
  16. 23 Oct 2026 · 09:33:49 UTC Source coverage: windows-known-issuesIncomplete → Current
  17. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  18. 23 Oct 2026 · 09:33:49 UTC Source coverage: windows-server-releasesIncomplete → Current
  19. 23 Oct 2026 · 09:33:49 UTC Source coverage: windows-11-releasesIncomplete → Current
  20. 23 Oct 2026 · 08:31:50 UTC Known issues resolvedNone in the collected release health data → Unknown: known-issue evidence is incomplete or retained
  21. 23 Oct 2026 · 08:31:50 UTC Known issues causedNone in the collected release health data → Unknown: known-issue evidence is incomplete or retained
  22. 23 Oct 2026 · 08:31:50 UTC Source coverage: windows-known-issuesCurrent → Incomplete
  23. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  24. 23 Oct 2026 · 08:31:50 UTC Source coverage: windows-server-releasesCurrent → Incomplete
  25. 23 Oct 2026 · 08:31:50 UTC Source coverage: windows-11-releasesCurrent → Incomplete
  26. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 15:16 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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