Microsoft releases Windows 10 KB5126657 extended security update
BLUF
Windows 10 users enrolled in extended support should install KB5126657 to receive October 2026 security fixes.
NEWS
Microsoft issued Windows 10 KB5126657 as an extended security update on October 13, 2026. The update includes this month's record-breaking Patch Tuesday security fixes along with a small number of bug fixes and changes.
Why I Care
Windows 10 is no longer in mainstream support, so eligible users depend on extended security updates to receive critical protections. Missing this update could leave systems exposed to vulnerabilities addressed in the October 2026 Patch Tuesday release.
Next Steps
IT administrators should test KB5126657 in a pilot group, then deploy it through Windows Update, WSUS, SCCM, or Intune as soon as compatibility is confirmed. Enrolled Windows 10 ESU users should apply the update promptly and review Microsoft's release notes for known issues.
Source: BleepingComputer ·