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Patch intelligence record

Windows 11 25H2 (Build 26200.9445)

ProductWindows 11 Version25H2 Release dateSep 8, 2026 File size
Evidence summary: Negative 15 user reports found

Community consensus not established — 15 user reports, evidence strength Low-Medium. This is a verified report sample, not live consensus telemetry.

Last evidence checked: Sep 21, 2026

AUXSAYS verdict WAIT

Current reports mention update/install failure and unspecified windows issue. This page covers one cumulative update, not the whole 25H2 servicing train; reports about a later update are counted on that update's own page.

Recommendations

  • Pause updates if this machine is doing deadline-sensitive or production work.
  • Check Microsoft's known-issue and safeguard-hold list for this KB before installing.
  • Keep the uninstall path in mind: a cumulative update can be removed from Settings > Windows Update > Update history for a limited window after installation.

Current reports mention update/install failure in windows update, unspecified windows issue in Windows workflow.

Community monitoring MONITORING ACTIVE
Accepted reports
15
Latest evidence run
Oct 6, 2026
Healthy sources
2 fresh (success / no reports) · need 2
  • Microsoft Q&A (search) Completed last checked Oct 6, 2026
  • techcommunity windows sitemap Completed last checked Oct 6, 2026

Monitoring reflects community-evidence collection health for this exact release — an absence of reports is not a safety guarantee, and this is separate from the AUXSAYS verdict.

Vendor Known Issues — 4 active vendor-known issues

4 active 4 resolved

Official vendor Release Health status. Not counted as community reports. Official source ↗

Official Patch Notes — vendor release notes captured from the official source

Windows 11 25H2 cumulative update, OS build 26200.9445 (KB5124008). Released 2026-09-08 on the General Availability Channel. Update type 2026-09 B. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page. Microsoft Release Health status (official) for Windows 11.

Windows 11 in these notes: .

Windows 11 25H2 cumulative update, OS build 26200.9445 (KB5124008). Released 2026-09-08 on the General Availability Channel. Update type 2026-09 B. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page.

Technical Details
Released
Sep 8, 2026
File size
Official source checked
Oct 6, 2026
Official notes checked
Oct 6, 2026
Checksum

Use these hashes to verify downloaded installers match the files published with the official release.

User Reports / Sources (15)

User report sources used for the current read.

Official sources