Windows Server · 2025 · Release · Out-of-band update

April 19, 2026—KB5091157 (OS Build 26100.32698) Out-of-band

Windows Server 2025: Current LTSC release

All 2025 builds JSON — this build from the builds API

Microsoft's known issues — KB5091157

  • Issue Known issue 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. BitLocker is enabled on the OS drive. 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). System Information ( msinfo32.exe ) reports Secure Boot State PCR7 Bindi Workaround: This issue is addressed in KB5094125 . After installing KB5094125 , devices with this incompatible group policy configuration are prevented from installing the 2023-signed Windows Boot Manager. If your device was impacted, Event ID 1032 will appear in the System event log when installing Windows updates: "The Secure Boot update Boot Manager (2023) was not applied due to a known incompatibility with the current BitLocker configuration." If you receive Event ID 1032 , Microsoft strongly recommends removing the Group Policy configuration before installing updates so that you can install the 2023-signed Windows Boot Manager and continue to receive the latest Secure Boot protections. Remove the G

Microsoft's release notes for KB5091157 ›

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