# CVE-2026-85357: Windows Phone Service Elevation of Privilege Vulnerability

CVE-2026-85357 is fixed in 12 products on 1 platform, first by KB5126653, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-85357
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 13, 2026
- Weakness: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85357

## Description

<p>Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Phone Service allows an authorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems | 22631.7652 | [KB5126653](https://patchblox.com/security/data/fix/microsoft/kb5126653.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems | 22631.7652 | [KB5126653](https://patchblox.com/security/data/fix/microsoft/kb5126653.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems |  | [KB5127648](https://patchblox.com/security/data/fix/microsoft/kb5127648.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems |  | [KB5127648](https://patchblox.com/security/data/fix/microsoft/kb5127648.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 25H2 for ARM64-based Systems |  | [KB5127648](https://patchblox.com/security/data/fix/microsoft/kb5127648.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 25H2 for x64-based Systems |  | [KB5127648](https://patchblox.com/security/data/fix/microsoft/kb5127648.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 26H1 for ARM64-based Systems | 28000.3231 | [KB5127646](https://patchblox.com/security/data/fix/microsoft/kb5127646.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 26H2 for ARM64-based Systems |  | [KB5127648](https://patchblox.com/security/data/fix/microsoft/kb5127648.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 26H2 for x64-based Systems |  | [KB5127648](https://patchblox.com/security/data/fix/microsoft/kb5127648.md) | Oct 13, 2026 |
| Microsoft | Windows 11 version 26H1 for x64-based Systems | 28000.3231 | [KB5127646](https://patchblox.com/security/data/fix/microsoft/kb5127646.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2022 | 20348.5761 | [KB5126655](https://patchblox.com/security/data/fix/microsoft/kb5126655.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.5761 | [KB5126655](https://patchblox.com/security/data/fix/microsoft/kb5126655.md) | Oct 13, 2026 |

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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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