KB5077796: Cumulative update for Windows 10, versions 21H2 and 22H2, January 2026. Remote Desktop sign-in failures fixed; cloud app hangs remain

Remote Desktop sign-in failures are fixed, but some apps may still hang when opening or saving cloud files. The update also improves Azure checks in the servicing stack.

Does it affect you? Applies to: This update applies to Windows 10 version 22H2 devices in the ESU program and Windows 10 Enterprise LTSC 2021, version 21H2. It installs builds 19045.6811 and 19044.6811, respectively.

What changes

Fix 1 change

Remote Desktop

Verified in package

For: Some Remote Desktop users

Some users can sign in to Remote Desktop again after failures with the Windows App and other Remote Desktop apps.¹
Fixes failures during authentication steps for different Remote Desktop applications on Windows.

Improvement 1 change

Servicing stack

For: Azure-hosted devices

The component that installs Windows updates improves its checks for devices hosted on Azure.²
The SSU uses an updated certificate chain to verify whether a device is hosted on Azure. Microsoft recommends installing it before additional updates on Azure-hosted devices and ensuring access to the required certificate update domains.

Known issues

Resolved Affects: Everyone Resolved by KB5075912

Some devices with Virtual Secure Mode enabled might fail to shut down or hibernate

Some PCs with Virtual Secure Mode enabled might restart instead of shutting down or hibernating. KB5075912 addresses this issue.³

Resolution Fixed in KB5075912

Install KB5075912 (or a later cumulative update) on affected devices. No manual workaround is required after updating.
Open Affects: Everyone

Apps might become unresponsive when saving files to cloud-based storage

Some apps may hang or show errors when opening or saving cloud files. This page lists the issue for KB5077796 and points to KB5078129 as addressing it.⁴

Workaround status No workaround yet

Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released: 2026-01-17
Classification: Updates
Type: Cumulative update
Restart: Required
Replaces: KB5073724, KB5074976, KB5071546, KB5068781

+29 earlier
KB5066791, KB5066198, KB5065429, KB5063842, KB5066188, KB5063709, KB5062649, KB5062554, KB5061087, KB5063159, KB5060533, KB5058481, KB5061979, KB5061768, KB5055612, KB5053643, KB5052077, KB5050081, KB5046714, KB5045594, KB5043131, KB5041582, KB5040525, KB5039299, KB5037849, KB5036979, KB5035941, KB5034843, KB5034203
Replaced by: KB5078129

Version	Build	Channel
21H2	19044.6811	General availability
22H2	19045.6811	General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 21H2 / 22H2

1.0 GB

windows10.0-kb5077796-x64.msu Main update · KB5077796 SHA-1: 5f97dfb1…b6e4ff

Arm64 21H2 / 22H2

719.6 MB

windows10.0-kb5077796-arm64.msu Main update · KB5077796 SHA-1: bf20e871…17f77f

x86 21H2 / 22H2

489.9 MB

windows10.0-kb5077796-x86.msu Main update · KB5077796 SHA-1: 169b227d…7b7772

Updated components

521 files changed since the previous update for the same versions.

Top changed components	Files
Audio	11
Graphics and display	10
Secure Boot	10
File Explorer and shell	5
Kernel	5
Security and sign-in	5
Remote Desktop	4
Hyper-V and virtualization	3
Emoji and input	2
Networking	2
Storage and file systems	2
Search	1

Verified in package: changed files confirm Remote Desktop.

Sources

Microsoft Support: KB5077796

Updated Nov 7, 2026

Cited passages from Microsoft's official notes (4)

1. Fixed: Some users experienced sign-in failures during Remote Desktop connections. This issue affected authentication steps for different Remote Desktop applications on Windows such as the Windows App. support.microsoft.com
2. This servicing stack update (SSU) includes enhanced logic to verify whether a device is hosted on Azure, leveraging an updated certificate chain for validation. support.microsoft.com
3. This issue is addressed in KB5075912. support.microsoft.com
4. This issue is addressed in KB5078129. support.microsoft.com

Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Sep 25, 2026

Quotes found in the official pages: passed
Numbers found in the sources: passed
Vulnerabilities from the dossier only: passed
Links to allowed domains only: passed
Every official change covered: passed
Readable plain text: passed
Changes confirmed by the file list: passed
Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake