Today is the second Tuesday of the month, making it Patch Tuesday, the day that all supported versions of Windows get updates. For Windows 10, that still means that every single version since release, except for 1511 and 1709, is getting an update; so much for the simplicity of an evergreen OS. Indeed, versions 1507, 1607, 1703, 1803, 1809, 1903, 1909, 2004, and 20H2 are getting updates today.
However, consumers on Windows 10 Home or Pro will only get it if they"re on version 1809 or higher. Support for version 1809 ends today (it continues for another six months if you"re on Windows 10 Enterprise or Education), and support for version 1903 ends next month. In fact, when support for version 1903 comes to an end, it will be the third time ever that Microsoft has completely ended support for a version of Windows 10.
If you"re on one of the two newest versions of Windows 10, 20H2 or 2004, you"re going to get KB4586781, bringing the build number to 19042.630 or 19041.630, respectively. You can manually download it here, and these are the highlights:
- Updates to improve security when using input devices such as a mouse, keyboard, or pen.
- Updates to improve security when using Microsoft Office products.
- Updates to improve security when Windows performs basic operations.
- Updates the 2020 DST start date for the Fiji Islands to December 20, 2020.
Here"s the full list of fixes:
- Updates the 2020 DST start date for the Fiji Islands to December 20, 2020.
- Security updates to the Microsoft Scripting Engine, Windows Input and Composition, Microsoft Graphics Component, the Windows Wallet Service, Windows Fundamentals, and the Windows Kernel.
This one has two known issues:
| Symptom | Workaround |
|---|---|
| Users of the Microsoft Input Method Editor (IME) for Japanese or Chinese languages might experience issues when attempting various tasks. You might have issues with input, receive unexpected results, or might not be able to enter text. | For more information about the issues, workaround steps, and the currently resolved issues, please see KB4564002 |
| System and user certificates might be lost when updating a device from Windows 10, version 1809 or later to a later version of Windows 10. Devices will only be impacted if they have already installed any Latest cumulative update (LCU) released September 16, 2020 or later and then proceed to update to a later version of Windows 10 from media or an installation source which does not have an LCU released October 13, 2020 or later integrated. This primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager. This might also happen when using outdated physical media or ISO images that do not have the latest updates integrated. Note Devices using Windows Update for Business or that connect directly to Windows Update are not impacted. Any device connecting to Windows Update should always receive the latest versions of the feature update, including the latest LCU, without any extra steps. | If you have already encountered this issue on your device, you can mitigate it within the uninstall window by going back to your previous version of Windows using the instructions here. The uninstall window might be 10 or 30 days depending on the configuration of your environment and the version you’re updating to. You will then need to update to the later version of Windows 10 after the issue is resolved in your environment. Note Within the uninstall window, you can increase the number of days you have to go back to your previous version of Windows 10 by using the DISM command /Set-OSUninstallWindow. You must make this change before the default uninstall window has lapsed. For more information, see DISM operating system uninstall command-line options. We are working on a resolution and will provide updated bundles and refreshed media in the coming weeks. |
If you"re on Windows 10 version 1909 or 1903, you"ll get KB4586786, bringing the build number to 18363.1198 or 18362.1198, respectively. You can manually download it here, and these are the highlights:
- Updates the 2020 DST start date for the Fiji Islands to December 20, 2020.
- Updates to improve security when using Microsoft Office products.
- Updates to improve security when using input devices such as a mouse, keyboard, or pen.
- Updates to improve security when Windows performs basic operations.
Here"s the full list of fixes:
- Updates the 2020 DST start date for the Fiji Islands to December 20, 2020.
- Addresses an issue with the package frame launcher (PSF) that passes a malformed parameter to a shim.
- Security updates to the Microsoft Scripting Engine, the Microsoft Graphics Component, Windows Input and Composition, the Windows Wallet Service, Windows Fundamentals, and the Windows Kernel.
This update has one known issue:
| Symptom | Workaround |
|---|---|
| System and user certificates might be lost when updating a device from Windows 10, version 1809 or later to a later version of Windows 10. Devices will only be impacted if they have already installed any Latest cumulative update (LCU) released September 16, 2020 or later and then proceed to update to a later version of Windows 10 from media or an installation source which does not have an LCU released October 13, 2020 or later integrated. This primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager. This might also happen when using outdated physical media or ISO images that do not have the latest updates integrated. Note Devices using Windows Update for Business or that connect directly to Windows Update are not impacted. Any device connecting to Windows Update should always receive the latest versions of the feature update, including the latest LCU, without any extra steps. | If you have already encountered this issue on your device, you can mitigate it within the uninstall window by going back to your previous version of Windows using the instructions here. The uninstall window might be 10 or 30 days depending on the configuration of your environment and the version you’re updating to. You will then need to update to the later version of Windows 10 after the issue is resolved in your environment. Note Within the uninstall window, you can increase the number of days you have to go back to your previous version of Windows 10 by using the DISM command /Set-OSUninstallWindow. You must make this change before the default uninstall window has lapsed. For more information, see DISM operating system uninstall command-line options. We are working on a resolution and will provide updated bundles and refreshed media in the coming weeks. |
If you"re still on Windows 10 version 1809, you"ll get KB4586793, bringing the build number to 17763.1577. You can manually download it here, and these are the highlights:
- Updates to improve security when using Microsoft Office products.
- Updates to improve security when using input devices such as a mouse, keyboard, or pen.
- Updates to improve security when Windows performs basic operations.
- Updates the 2020 DST start date for the Fiji Islands to December 20, 2020.
Here"s the full list of fixes:
Updates the 2020 DST start date for the Fiji Islands to December 20, 2020.
Security updates to the Microsoft Scripting Engine, Microsoft Graphics Component, Windows Input and Composition, the Windows Wallet Service, Windows Fundamentals, and the Windows Kernel.
This one also has one known issue:
| Symptom | Workaround |
|---|---|
| After installing KB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND." |
Note If reinstalling the language pack does not mitigate the issue, reset your PC as follows:
Microsoft is working on a resolution and will provide an update in an upcoming release. |
The rest of the updates are only available for certain SKUs of Windows 10. Here"s the full list:
| Version | KB | Build | Download | Support |
|---|---|---|---|---|
| 1803 | 17134.1845 | Update Catalog | Enterprise and Education SKUs | |
| 1703 | 15063.2554 | Update Catalog | Surface Hub only | |
| 1607 | 14393.4046 | Update Catalog | Long-Term Servicing Branch | |
| 1507 | 10240.18756 | Update Catalog |
As always, Patch Tuesday updates are mandatory. That means that you can install them through Windows Update, and if you don"t, they"ll be installed automatically at some point.