Patch tracker / KB5120996
KB5120996: Windows 11 Optional preview update (August 2026)
KB5120996 is a non-security optional preview update for Windows 11, released 2026-08-27, producing OS build 28000.2804. It closes no vulnerabilities, so it carries no Severity rank and appears in no security feed.
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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.
A newer security update for Windows 11 has shipped since this one: KB5134130 (2026-10-26). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.
Senserva AI Opinion and rich prompt for KB5120996
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Check if KB5120996 is installed
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Windows release health for this update
From Microsoft's Windows release health for Windows 11, version 26H1, checked 2026-10-27. Microsoft's issue text is linked from each title.
Issues Microsoft traces to this update
- Devices might experience a black screen or desktop loading issues after sign-in
Resolved by KB5127646. Microsoft last updated it 2026-10-13 10:13 PT.
Other open issues on these Windows versions
- Remote Desktop connections might fail for non-admin users with error 0xC000000D
Mitigated. Microsoft last updated it 2026-10-13 10:13 PT.
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 August 2026
KB5120228
211 CVEs · Critical · exploitedKB5120229
191 CVEs · Critical · exploitedKB5120233
211 CVEs · Critical · exploitedKB5120238
181 CVEs · Critical · exploitedKB5120240
166 CVEs · Critical · exploitedKB5120242
191 CVEs · Critical · exploitedKB5120385
142 CVEs · Critical · exploitedKB5120386
137 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.