Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB. These original certificates are approaching expiration, and devices containing affected certificate versions must update them to maintain Secure Boot functionality and avoid compromising security by losing security fixes related to Windows boot manager or Secure Boot.
The operating system’s certificate update protection mechanism relies on firmware components that might contain defects, which can cause certificate trust updates to fail or behave unpredictably. This leads to potential disruption of the Secure Boot trust chain and requires careful validation and deployment to restore intended security guarantees.
| Certificate Authority (CA) | Location | Purpose | Expiration Date |
|---|---|---|---|
| Microsoft Corporation KEK CA 2011 | KEK | Signs updates to the DB and DBX | 06/24/2026 |
| Microsoft Corporation UEFI CA 2011 | DB | Signs 3rd party boot loaders, Option ROMs, etc. | 06/27/2026 |
| Microsoft Windows Production PCA 2011 | DB | Signs the Windows Boot Manager | 10/19/2026 |
For more information see this CVE and Windows Secure Boot certificate expiration and CA updates.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.8783 | [KB5073722](https://patchblox.com/security/data/fix/microsoft/kb5073722.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.8783 | [KB5073722](https://patchblox.com/security/data/fix/microsoft/kb5073722.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.8276 | [KB5073723](https://patchblox.com/security/data/fix/microsoft/kb5073723.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.8276 | [KB5073723](https://patchblox.com/security/data/fix/microsoft/kb5073723.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 21H2 for 32-bit Systems | | [KB5073724](https://patchblox.com/security/data/fix/microsoft/kb5073724.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 21H2 for ARM64-based Systems | | [KB5073724](https://patchblox.com/security/data/fix/microsoft/kb5073724.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 21H2 for x64-based Systems | | [KB5073724](https://patchblox.com/security/data/fix/microsoft/kb5073724.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 22H2 for 32-bit Systems | | [KB5073724](https://patchblox.com/security/data/fix/microsoft/kb5073724.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 22H2 for ARM64-based Systems | | [KB5073724](https://patchblox.com/security/data/fix/microsoft/kb5073724.md) | Jan 13, 2026 | | Microsoft | Windows 10 Version 22H2 for x64-based Systems | | [KB5073724](https://patchblox.com/security/data/fix/microsoft/kb5073724.md) | Jan 13, 2026 | | Microsoft | Windows 11 Version 23H2 for ARM64-based Systems | 22631.6491 | [KB5073455](https://patchblox.com/security/data/fix/microsoft/kb5073455.md) | Jan 13, 2026 | | Microsoft | Windows 11 Version 23H2 for x64-based Systems | 22631.6491 | [KB5073455](https://patchblox.com/security/data/fix/microsoft/kb5073455.md) | Jan 13, 2026 | | Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 | | Microsoft | Windows 11 Version 24H2 for x64-based Systems | | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 | | Microsoft | Windows 11 Version 25H2 for ARM64-based Systems | | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 | | Microsoft | Windows 11 Version 25H2 for x64-based Systems | | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 | | [KB5073698](https://patchblox.com/security/data/fix/microsoft/kb5073698.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB5073698](https://patchblox.com/security/data/fix/microsoft/kb5073698.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 R2 | | [KB5073696](https://patchblox.com/security/data/fix/microsoft/kb5073696.md) | Jan 13, 2026 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB5073696](https://patchblox.com/security/data/fix/microsoft/kb5073696.md) | Jan 13, 2026 | | Microsoft | Windows Server 2016 | 14393.8783 | [KB5073722](https://patchblox.com/security/data/fix/microsoft/kb5073722.md) | Jan 13, 2026 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.8783 | [KB5073722](https://patchblox.com/security/data/fix/microsoft/kb5073722.md) | Jan 13, 2026 | | Microsoft | Windows Server 2019 | 17763.8276 | [KB5073723](https://patchblox.com/security/data/fix/microsoft/kb5073723.md) | Jan 13, 2026 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.8276 | [KB5073723](https://patchblox.com/security/data/fix/microsoft/kb5073723.md) | Jan 13, 2026 | | Microsoft | Windows Server 2022 | 20348.4648 | [KB5073457](https://patchblox.com/security/data/fix/microsoft/kb5073457.md) | Jan 13, 2026 | | Microsoft | Windows Server 2022 (Server Core installation) | 20348.4648 | [KB5073457](https://patchblox.com/security/data/fix/microsoft/kb5073457.md) | Jan 13, 2026 | | Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.2092 | [KB5073450](https://patchblox.com/security/data/fix/microsoft/kb5073450.md) | Jan 13, 2026 | | Microsoft | Windows Server 2025 | 26100.32230 | [KB5073379](https://patchblox.com/security/data/fix/microsoft/kb5073379.md) | Jan 13, 2026 | | Microsoft | Windows Server 2025 (Server Core installation) | 26100.32230 | [KB5073379](https://patchblox.com/security/data/fix/microsoft/kb5073379.md) | Jan 13, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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