CyberNew CyberNew
Defensive Security & Blue Team BleepingComputer 3 weeks ago

Windows 11 KB5124010 update released with 46 changes and fixes

CN
CyberNew Threat Research Desk
• Original Reporting: BleepingComputer
CyberNew Threat Intel Assessment
Assessed Severity: MEDIUM
Impacted Surface
Client Endpoints & Operating Systems
Intelligence Sector
Defensive Security & Blue Team

Analyst Takeaway

"Microsoft released the KB5124010 September 2026 non-security preview update for Windows 11 24H2 and 25H2, with 46 changes including Bluetooth improvements and the ability to remap the Copilot key. KB5124010 is a preview update that lets administrators and users test Windows improvements, bug fixes, and new features before they become generally available during next month's Patch Tuesday release...."

Recommended Defense & Mitigation

  • Threat Monitoring: Ingest published IOCs into SIEM/EDR detection rules for continuous telemetry monitoring.
  • Security Awareness: Alert staff and maintain baseline endpoint hardening across endpoints.
Curated & Verified by CyberNew Threat Intelligence Desk Standard Defense Framework (NIST / MITRE ATT&CK)

Windows 11

Microsoft released the KB5124010 September 2026 non-security preview update for Windows 11 24H2 and 25H2, with 46 changes including Bluetooth improvements and the ability to remap the Copilot key.

KB5124010 is a preview update that lets administrators and users test Windows improvements, bug fixes, and new features before they become generally available during next month's Patch Tuesday release.

However, unlike regular cumulative updates, monthly optional updates like KB5124010 provide only quality improvements and don't include security fixes.

The September 2026 preview update adds support for Emoji 17.0, a new "Open apps maximized" accessibility setting that automatically maximizes app windows as they open, and a recovery remote management plug-in for extending Windows Recovery (WinRE) management capabilities.

Save your seat

Source Verification & Original Intelligence

This threat report was reviewed by CyberNew analysts and cross-referenced with primary security disclosures from BleepingComputer.

Primary Advisory →