The Update BureauBuild 26300.9278: Windows Insider Release Preview Channel, August 2026. Version 26H2 arrives through an enablement package
In short
Windows 11 version 26H2 is being delivered to Release Preview Channel Insiders through an enablement package. The notes announce no feature changes.
Does it affect you? Applies to: Devices enrolled in the Release Preview Channel that receive Windows 11 version 26H2.
This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.
In detail
- Other Windows 11 version 26H2 is delivered to the Release Preview Channel through an enablement package (eKB).1
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2026-08-27
- Type
- Windows Insider build
| Version | Build | Channel |
|---|---|---|
| 26H2 | 26300.9278 | Release Preview Channel |
Security
No vulnerabilities are listed for this update.
Sources
Updated
Cited passages from Microsoft's official notes (1)
-
1.
Windows 11, version 26H2 is delivered to Release Preview via an enablement package (eKB).
learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 4/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake