# KB5129194: September 2026 cumulative update for Windows 11 22H2

KB5129194, released September 14, 2026, fixes 2 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb5129194
- Platform: Microsoft
- Released: Sep 14, 2026
- Priority: Urgent (Closes CVE-2026-85921, rated Critical)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5129194

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows 11 Version 26H1 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-26h1-for-arm64-based-systems.md) |  | 28000.2956 |
| [Windows 11 version 26H1 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-26h1-for-x64-based-systems.md) |  | 28000.2956 |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-85921](https://patchblox.com/security/data/cve/CVE-2026-85921.md) | Urgent | Windows Secure Kernel Mode | 8.2 | 0.0035 |  |
| [CVE-2026-62721](https://patchblox.com/security/data/cve/CVE-2026-62721.md) | Urgent | User-Mode Power Service (UMPS) | 7.8 | 0.0030 | More likely |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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