Patch Tuesday

Windows 10
1903 – October 8, 2019—KB4517389 (OS Build 18362.418)
1809 – October 8, 2019—KB4519338 (OS Build 17763.805)
Highlights
Updates to improve security when using Internet Explorer and Microsoft Edge.
Updates for verifying user names and passwords.
Updates for storing and managing files.

Improvements and fixes
This security update includes quality improvements. Key changes include:
Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. This issue occurs while performing full Transport Layer Security (TLS) handshakes from devices that don’t support EMS, especially on servers. EMS support has been available for all the supported versions of Windows since calendar year 2015 and is being incrementally enforced by the installation of the October 8, 2019 and later monthly updates.
Addresses an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.
Security updates to Windows Shell, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows Cryptography, Windows Authentication, Windows Storage and Filesystems, Windows Kernel, Microsoft Scripting Engine, and Windows Server.

Windows 8.1
October 8, 2019—KB4520005 (Monthly Rollup)
This security update includes improvements and fixes that were a part of update KB4516041 (released September 24, 2019) and addresses the following issues:
Addresses an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.
Security updates to Windows Cryptography, Windows Authentication, Windows Kernel, Windows Storage and Filesystems, Microsoft JET Database Engine, Internet Information Services, the Microsoft Scripting Engine, and Windows Server.

October 8, 2019—KB4519990 (Security-only update)
This security update includes quality improvements. Key changes include:
Security updates to Windows Cryptography, Windows Authentication, Windows Kernel, Windows Storage and Filesystems, Microsoft JET Database Engine, Internet Information Services, and Windows Server.

Windows 7
October 8, 2019—KB4519976 (Monthly Rollup)
This security update includes improvements and fixes that were a part of update KB4516048 (released September 24, 2019) and addresses the following issues:
Addresses an issue that may fail to disable VBScript in Internet Explorer by default after installing KB4507437 (Preview of Monthly Rollup) or KB4511872 (Internet Explorer Cumulative Update) and later.
Addresses an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.
Security updates to Windows Authentication, Microsoft JET Database Engine, Windows Kernel, Internet Information Services, the Microsoft Scripting Engine, and Windows Server.

October 8, 2019—KB4520003 (Security-only update)
This security update includes quality improvements. Key changes include:
Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. This issue occurs while performing full Transport Layer Security (TLS) handshakes from devices that don’t support EMS, especially on servers. EMS support has been available for all the supported versions of Windows since calendar year 2015 and is being incrementally enforced by the installation of the October 8, 2019 and later monthly updates.
Security updates to Windows Authentication, Microsoft JET Database Engine, Windows Kernel, Internet Information Services, and Windows Server.