Windows Server 2022 Update (KB5078136) Rolled Out
Microsoft released KB5078136 today for Windows Server 2022. This update builds on the OS Build 20348.4651 and incorporates fixes and enhancements from previous updates, such as the January security release (KB5073457) and the subsequent OOB fix (KB5077800). You can find all kinds of details by checking Microsoft's own resources.
If you want a better handle on what these different Windows update types mean, head over to their website. There are explanations for cumulative security updates versus continuous innovation cycles available there that might help clarify things. For specifics about this KB5078136 release, the usual places like the Windows release health dashboard or the server update history page offer solid information.
One noticeable thing in this latest OOB pack is addressing several quality issues reported after installing previous builds. Notably, some users experienced problems with file systems; applications would sometimes freeze or throw errors when dealing with cloud storage services like OneDrive or Dropbox. Others ran into Outlook troubles where emails wouldn't save correctly; in a few cases, restarting the system was needed just to recover.
It's also important that if you've already applied earlier updates, this new one shouldn't download much since it only installs what hasn't been covered before. It should feel like an update on top of what many users likely have installed now.
However, there is a known snag: WSUS can't currently show detailed sync error info because a recent change fixed the Remote Code Execution Vulnerability (CVE-2025-59287).
Check out the linked Microsoft support article below for more details:
January 24, 2026—KB5078136 (OS Build 20348.4651) Out-of-band - Microsoft Support
January 24, 2026—KB5078136 (OS Build 20348.4651) Out-of-band - Microsoft Support
