Patch tracker / KB5129237
KB5129237: Windows Server Out-of-band update (September 2026)
KB5129237 is a non-security out-of-band update for Windows Server, released 2026-09-14, producing OS build 20348.5631. It closes no vulnerabilities, so it carries no Severity rank and appears in no security feed.
Before you deploy: Microsoft lists 2 known issues for this update.
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Update summary
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.
Microsoft documents 2 known issues with this update.
- Windows Server Update Services (WSUS) does not display error details
- USB Audio Class 1.0 devices with error Code 10 or no output
Senserva AI Opinion and rich prompt for KB5129237
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Check if KB5129237 is installed
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Known issues, from Microsoft
Quoted from Microsoft's support article for KB5129237 (checked 2026-09-15). Microsoft lists 2 known issues. Verify against the article before acting.
1. Windows Server Update Services (WSUS) does not display error details
After installing KB5070884 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287 .
2. USB Audio Class 1.0 devices with error Code 10 or no output
Symptoms
After installing the September 8, 2026, Windows security update, some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
The device displays an error in Device Manager: "This device cannot start (Code 10).”
No audio output.
Volume controls are unresponsive or remain at zero.
Sound settings are unresponsive or unavailable.
This issue is limited to USB Audio Class 1.0 devices.
Resolution
Microsoft is working on a resolution and will update this documentation when more information is available.
Windows release health for this update
From Microsoft's Windows release health for Windows Server 2022, checked 2026-10-26. Microsoft's issue text is linked from each title.
Issues this update resolves
- USB audio devices might fail to start or produce no sound
Resolved. Microsoft last updated it 2026-10-13 11:02 PT.
Other open issues on these Windows versions
- Users might be unable to sign in to OWA or send emails on Exchange Server
Mitigated. Microsoft last updated it 2026-10-16 21:48 PT.
From the Senserva blog
- Microsoft's September 2026 Out-of-Band Update
September 14, 2026 · Mark Shavlik
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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|
Scope and sources
- Affected products
- Also released in September 2026
KB5122871
684 CVEs · Critical · exploitedKB5122876
620 CVEs · Critical · exploitedKB5122878
572 CVEs · Critical · exploitedKB5122880
608 CVEs · Critical · exploitedKB5122882
645 CVEs · Critical · exploitedKB5123065
398 CVEs · Critical · exploitedKB5123066
423 CVEs · Critical · exploitedKB5123099
559 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.