KB5087420
詳細情報
| KB番号 | KB5087420 |
|---|---|
| リリース日 | 2026/05/12 |
| Windowsバージョン | Windows 11 23H2 |
| ビルド番号 | 22631.7079 |
| URL(英語) | https://support.microsoft.com/en-us/help/5087420 |
| URL(日本語) | https://support.microsoft.com/ja-jp/help/5087420 |
| ダウンロード | Microsoft Update Catalog |
ハイライト(英語)
ありません
改良点(英語)
[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. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
[Country and Operator Settings Asset (COSA)] This update brings profiles up to date for certain mobile operators.
[Daylight saving time (DST)] This update supports the 2023 DST change for the Arab Republic of Egypt.
[Enterprise State Roaming (ESR)] ESR can now be managed through Windows Backup for Organizations policies. This makes setup easier for IT administrators. To learn more, see Enterprise State Roaming.
[Microsoft Defender SmartScreen] This update enables Microsoft Defender SmartScreen in the Windows shell to send file hashes for unsigned files. This support allows SmartScreen to use newer reputation models and improves the quality of application reputation checks.
Remote Desktop (known issue)] Fixed: This update addresses an issue that affects the Remote Desktop Connection security warning dialog. The dialog could render incorrectly in multi-monitor scenario when the monitors had different scaling set. This might occur after installing the April 2026 (KB5082052) security update. For more information, see Understanding security warnings when opening Remote Desktop (RDP) files.
既知の不具合(英語)
Symptom
Some devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key on the first restart after installing this update.
This issue only affects a limited number of systems in which ALL of the following conditions are true. These conditions are unlikely to be found on personal devices not managed by IT departments.
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BitLocker is enabled on the OS drive.
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The Group Policy "Configure TPM platform validation profile for native UEFI firmware configurations" is configured, and PCR7 is included in the validation profile (or the equivalent registry key is set manually).
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System Information (msinfo32.exe) reports Secure Boot State PCR7 Binding as "Not Possible".
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The Windows UEFI CA 2023 certificate is present in the device’s Secure Boot Signature Database (DB), making the device eligible for the 2023‑signed Windows Boot Manager to be made the default.
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The device is not already running the 2023-signed Windows Boot Manager.
In this scenario, the BitLocker recovery key only needs to be entered once -- subsequent restarts will not trigger a BitLocker recovery screen, as long as the group policy configuration remains unchanged. For help finding your BitLocker recovery key, see the article, Find your BitLocker recovery key.
Enterprises are recommended to audit their BitLocker group policies for explicit PCR7 inclusion and check msinfo32.exe for their PCR7 binding status before installing this update. (See the Workaround below.)
Workaround
Remove the Group Policy configuration before installing the update (Recommended)
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Open Group Policy Editor (gpedit.msc) or your Group Policy Management Console.
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Navigate to: Computer Configuration > Administrative Templates > Windows Components > BitLocker Drive Encryption > Operating System Drives.
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Set "Configure TPM platform validation profile for native UEFI firmware configurations" to "Not Configured".
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Run the following command on affected devices to propagate the policy change: gpupdate /force
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Run the following command to suspend BitLocker (where BitLocker is enabled on the C: drive): manage-bde -protectors -disable C:
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Run the following command to resume BitLocker (where BitLocker is enabled on the C: drive): manage-bde -protectors -enable C:
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This updates the BitLocker bindings to use the Windows-selected default PCR profile.
A permanent resolution for this issue is planned in a future Windows update. More information will be provided when it is available.
ハイライト(日本語)
日本語版が用意されていません
改良点(日本語)
日本語版が用意されていません
既知の不具合(日本語)
日本語版が用意されていません
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