Windows 11 23H2 · KB5122880 · Build 22631.7582

What changed

Microsoft published the 2026-09-08 security baseline for Windows 11 23H2 with KB5122880 and build 22631.7582.

Technical details

• KB5122880 security update for Windows 11 23H2
• OS build 22631.7582

Why it matters

The current Microsoft KB and OS build are the baseline for deployment rings, compliance and servicing reports.

Known limitations

• Review the linked Microsoft KB for current known issues, safeguards and resolved issues.

Now check

• Validate KB5122880 and build 22631.7582 in the pilot ring
• Review the Microsoft KB known-issue section
• Confirm servicing stack and update media prerequisites