Windows 11 23H2: Security Update im Detail

What changed

Das Juli LCU enthält die aktuellen Security Fixes und die von Microsoft dokumentierten Quality Fixes für Windows 11 23H2.

Technical details

• Security: August security fixes
• Connectivity: refreshed SolNet-Mobile COSA profile
• Device management: improves managed-device reliability when an MDM certificate expires
• File History: improves SMB network-share backup reliability
• Secure Boot: expanded high-confidence device targeting
• Emoji panel: adds GIPHY support
• Servicing stack: KB5120239 to build 22621.7513

Why it matters

Der Zielbuild ist die operative Grundlage für Patch Compliance, Pilot Rings, Wartungsfenster und Referenzimages.

Known limitations

• Microsoft currently reports no known issue
• Windows 11 23H2 Enterprise and Education reach end of updates on 10 November 2026
• Use EKB KB5027397 for the Windows 11 23H2 enablement path

Now check

• Deploy KB5120240 to the 23H2 pilot ring
• Validate MDM certificate expiry and SMB File History scenarios
• Review 23H2 exit planning before November