# KB5129195: September 2026 cumulative update for Windows 11 22H2

KB5129195, released September 14, 2026, fixes 1 CVE across 4 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb5129195
- Platform: Microsoft
- Released: Sep 14, 2026
- Priority: Urgent (Closes CVE-2026-62721, exploitation more likely)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5129195

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows 11 Version 24H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-24h2-for-arm64-based-systems.md) |  |  |
| [Windows 11 Version 24H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-24h2-for-x64-based-systems.md) |  |  |
| [Windows 11 Version 25H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-25h2-for-arm64-based-systems.md) |  |  |
| [Windows 11 Version 25H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-25h2-for-x64-based-systems.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [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 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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