January 24, 2026—KB5078133 (OS Build 25398.2097) Out-of-band

January 24, 2026—KB5078133 OS Build 25398.2097 Out-of-band ​​​​This out-of-band update for Windows Server 23H2 KB5078133 is cumulative. It includes updates from previous security, along with an additional fix. To learn more about differences between security updates, optional non-security preview...