Microsoft releases KB5078885 as the latest Windows 10 extended security update

While updates for Windows 11 can be quite interesting in terms of the new features they bring, those that are now being released for Windows 10 are focused on nothing but security.

This is true of the KB5078885 update released by Microsoft this week. This is the latest extended security update for Windows 10, and it addresses a large number of issues with the aging operating system.

The update is available for Windows 10 versions 21H2 and 22H2 and it is part of the Patch Tuesday releases for March. Across various pieces of software, Microsoft has used the patches released this time around to fix almost 80 security problems.

In the release notes for the KB5078885 update, the company details the main changes and fixes which are included:

• [Windows System Image Manager] This update adds a warning dialog to help users confirm that the selected catalog file comes from a trusted source.
• [File History] Improved: File History in Control Panel when backing up files. New files with names containing some Chinese and Private Use Area characters can now be backed up.
• [Graphics] Improved: A stability issue affecting certain GPU configurations.
• [Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. This targeting is based primarily on client device diagnostic data; due to limited data, servers are unlikely to qualify, though not explicitly excluded. Devices receive new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.

Microsoft points out that that March update also includes fixes that were released latest month in the KB5075912 update. At the time of release, Microsoft shared the following details of which problems this update addressed:

• [Fonts] This update includes changes to Chinese fonts to meet GB18030-2022A compliance.
• [OS Security (known issue)] Fixed: After installing the Windows security update released on or after January 13, 2026, some Secure Launch-capable PCs with Virtual Secure Mode (VSM) enabled are unable to shut down or enter hibernation. Instead, the device restarts.
• [Folders] Fixed: This update fixes an issue that affects folder renaming with desktop.ini files in File Explorer. The LocalizedResourceName setting was ignored, so custom folder names did not show. Now, custom folder names appear as expected.
• [Graphics] Fixed: A stability issue affecting certain graphics processing units (GPUs) configurations.
• [Secure Boot] With this update, Windows quality updates include a broad set of targeting data that identifies devices and their ability to receive new Secure Boot certificates. Devices will receive the new certificates only after they show sufficient successful update signals, which helps ensure a safe and phased rollout.

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