Patch tracker / KB5129236

KB5129236: Windows 10 Out-of-band update (September 2026)

KB5129236 is a non-security out-of-band update for Windows 10, released 2026-09-14, producing OS build 19045.7727, 19044.7727. It closes no vulnerabilities, so it carries no Severity rank and appears in no security feed.

Update summary

Out-of-band updateNo security fixes
2026-09-14
Released
Out-of-band update
Update type
19045.7727, 19044.7727
OS build
Windows 10
Applies to

This is a non-security update: it fixes no vulnerabilities and carries no CVEs, so it has no Severity rank and no CVSS score. It is not in Microsoft's security feed, which is why most vulnerability trackers do not list it at all. Installing it is a reliability and features decision rather than a risk one.

Senserva found thisno known issues as of our last check

We checked Microsoft's support article for KB5129236 on 2026-09-15 and it lists no known issues. Read the article before broad deployment; Microsoft adds issues as reports come in, and we re-check on every refresh.

Microsoft Update Catalog: download KB5129236Microsoft support article: what changed
Senserva AI Opinion and rich prompt for KB5129236

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Check if KB5129236 is installed

Elevated PowerShell. No output means it is not installed.

Windows release health for this update

From Microsoft's Windows release health for Windows 10, version 22H2; Windows 10, version 21H2, checked 2026-10-06. Microsoft's issue text is linked from each title.

Issues this update resolves

Other open issues on these Windows versions

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited

Scope and sources

Affected products
Also released in September 2026

KB5122871

679 CVEs · Critical · exploited

KB5122876

616 CVEs · Critical · exploited

KB5122878

568 CVEs · Critical · exploited

KB5122880

602 CVEs · Critical · exploited

KB5122882

641 CVEs · Critical · exploited

KB5123065

393 CVEs · Critical · exploited

KB5123066

418 CVEs · Critical · exploited

KB5123099

555 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5129236 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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