IT Reference & Documentation

KB5079391 — March 2026 Cumulative Update Preview for Windows 11

KB5079391 is a March 2026 cumulative update preview that delivers quality improvements and bug fixes for Windows 11 version 24H2 and 23H2, updating systems to builds 26200.8116 and 26100.8116 respectively.

KB5079489 — March 2026 Cumulative Update for Windows 11 (OS Build 28000.1764)

KB5079489 is a March 2026 cumulative update for Windows 11 that addresses multiple system stability issues, improves performance, and includes security enhancements for OS Build 28000.1764.

KB5073722 — January 2026 Cumulative Update for Windows 10 Version 1607

KB5073722 is a January 2026 cumulative update for Windows 10 Version 1607 (Anniversary Update) that addresses security vulnerabilities, improves system stability, and includes quality improvements for legacy Windows 10 systems.

KB5073723 — January 2026 Cumulative Update for Windows 10 Version 1809

KB5073723 is a cumulative update released January 13, 2026, for Windows 10 Version 1809 (October 2018 Update), bringing the OS build to 17763.8276 with security fixes and quality improvements.

KB5077795 — Out-of-band Update for Windows 10 Version 1809

KB5077795 is an out-of-band cumulative update released January 17, 2026, that addresses critical security vulnerabilities and system stability issues in Windows 10 Version 1809 (October 2018 Update).

KB5078131 — Out-of-band Security Update for Windows 10 Version 1809

KB5078131 is an out-of-band security update released January 24, 2026, addressing critical vulnerabilities in Windows 10 Version 1809 (OS Build 17763.8281).

KB5078129 — January 2026 Out-of-Band Cumulative Update for Windows 10

KB5078129 is an out-of-band cumulative update released January 24, 2026, addressing critical security vulnerabilities and system stability issues in Windows 10 versions 21H2 and 22H2.

KB5073724 — January 2026 Cumulative Update for Windows 10

KB5073724 is a January 2026 cumulative update that brings Windows 10 to builds 19045.6809 and 19044.6809, addressing security vulnerabilities, system stability issues, and compatibility improvements.

KB5077796 — Out-of-band Update for Windows 10 Version 21H2 and 22H2

KB5077796 is an out-of-band cumulative update released January 17, 2026, addressing critical security vulnerabilities and system stability issues in Windows 10 Version 21H2 and 22H2.

KB5073455 — January 2026 Cumulative Update for Windows 11 Version 23H2

KB5073455 is a January 2026 cumulative update that brings Windows 11 Version 23H2 to Build 22631.6491, addressing security vulnerabilities, system stability issues, and performance improvements.

KB5074105 — January 2026 Cumulative Update Preview for Windows 11

KB5074105 is a January 2026 cumulative update preview for Windows 11 that delivers quality improvements, security enhancements, and feature updates to builds 26200.7705 and 26100.7705.

KB5074109 — January 2026 Cumulative Update for Windows 11

KB5074109 is a January 2026 cumulative update that delivers security fixes, performance improvements, and feature enhancements for Windows 11 versions 23H2 and 24H2.

KB5078132 — January 2026 Out-of-Band Update for Windows 11

KB5078132 is an out-of-band cumulative update released January 24, 2026, that addresses critical security vulnerabilities and system stability issues affecting Windows 11 version 23H2.

KB5078127 — Out-of-band Cumulative Update for Windows 11 (January 2026)

KB5078127 is an out-of-band cumulative update released January 24, 2026, addressing critical security vulnerabilities and system stability issues in Windows 11 versions 23H2 and 24H2.

KB5077797 — Out-of-band Update for Windows 11 Version 23H2

KB5077797 is an out-of-band cumulative update released January 17, 2026, that addresses critical system stability issues and security vulnerabilities in Windows 11 Version 23H2, updating systems to OS Build 22631.6494.

KB5077744 — January 2026 Out-of-Band Cumulative Update for Windows 11

KB5077744 is an out-of-band cumulative update released January 17, 2026, addressing critical security vulnerabilities and system stability issues in Windows 11 versions 23H2 and 24H2.

KB5077241 — February 2026 Cumulative Update Preview for Windows 11

KB5077241 is a February 2026 cumulative update preview that delivers quality improvements and bug fixes for Windows 11 version 24H2 and 23H2, updating systems to builds 26200.7922 and 26100.7922 respectively.

KB5077239 — February 2026 Cumulative Update for Windows 11 Version 24H2

KB5077239 is a February 2026 cumulative update that addresses multiple security vulnerabilities and system stability issues in Windows 11 Version 24H2, bringing the OS build to 28000.1643.

KB5085516 — March 2026 Cumulative Update for Windows 10 and Windows 11

KB5085516 is a March 2026 cumulative update that addresses critical security vulnerabilities, improves system stability, and resolves compatibility issues affecting Windows 10 version 22H2 and Windows 11 versions 22H2, 23H2, and 24H2.

Windows Event ID 36888 – Schannel: TLS/SSL Handshake Failure with Certificate Validation Error

Event ID 36888 indicates a TLS/SSL handshake failure in the Schannel security provider, typically caused by certificate validation errors, protocol mismatches, or cipher suite incompatibilities during secure connection attempts.