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KB5124006DOptional non-security preview · 2026-09 D

Optional non-security preview for Windows 11, version 26H1

Support article Update Catalog CVEs in Security CVE list for a ticket

Is it safe to deploy?

Pilot firstKB5124006D

An optional preview. Install it on pilot devices to catch problems before next Patch Tuesday.

UrgencyCritical · 1 exploited RiskModerate · 2 mitigated
Everything in the September 2026 Patch Tuesday cycle
1Windows version
0CVEs fixed · 0 critical
0Exploited or in CISA KEV
2Open known issues affecting it
—Restart required (per MSRC)

Applies to

From Microsoft's release-information tables
Servicing branchOS buildReleaseAvailable
Windows 11, version 26H1 28000.3086 D 2026-09 D 22 Sep 2026

Known issues in this update

Includes issues from the update it builds on

Issues this update resolves

No resolved issues listed

Windows release health names no issues fixed by this KB.

Security fixes

0 Microsoft CVEs · most urgent first

No CVE fixes listed

MSRC lists no CVEs for this KB in the collected releases; preview (D) and out-of-band updates often carry no new security fixes.

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