# CVE-2026-50331: Windows Application Model Core API Elevation of Privilege Vulnerability

CVE-2026-50331 is fixed in 23 products on 1 platform, first by KB5099535, released July 14, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-50331
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 14, 2026
- Weakness: Use After Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50331

## Description

<p>Use after free in Windows Application Model allows an authorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.9339 | [KB5099535](https://patchblox.com/security/data/fix/microsoft/kb5099535.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.9339 | [KB5099535](https://patchblox.com/security/data/fix/microsoft/kb5099535.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.9020 | [KB5099538](https://patchblox.com/security/data/fix/microsoft/kb5099538.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.9020 | [KB5099538](https://patchblox.com/security/data/fix/microsoft/kb5099538.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 21H2 for 32-bit Systems |  | [KB5099539](https://patchblox.com/security/data/fix/microsoft/kb5099539.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5099539](https://patchblox.com/security/data/fix/microsoft/kb5099539.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 21H2 for x64-based Systems |  | [KB5099539](https://patchblox.com/security/data/fix/microsoft/kb5099539.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 22H2 for 32-bit Systems |  | [KB5099539](https://patchblox.com/security/data/fix/microsoft/kb5099539.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 22H2 for ARM64-based Systems |  | [KB5099539](https://patchblox.com/security/data/fix/microsoft/kb5099539.md) | Jul 14, 2026 |
| Microsoft | Windows 10 Version 22H2 for x64-based Systems |  | [KB5099539](https://patchblox.com/security/data/fix/microsoft/kb5099539.md) | Jul 14, 2026 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems |  | [KB5101650](https://patchblox.com/security/data/fix/microsoft/kb5101650.md) | Jul 14, 2026 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems |  | [KB5101650](https://patchblox.com/security/data/fix/microsoft/kb5101650.md) | Jul 14, 2026 |
| Microsoft | Windows 11 Version 25H2 for ARM64-based Systems |  | [KB5101650](https://patchblox.com/security/data/fix/microsoft/kb5101650.md) | Jul 14, 2026 |
| Microsoft | Windows 11 Version 25H2 for x64-based Systems |  | [KB5101650](https://patchblox.com/security/data/fix/microsoft/kb5101650.md) | Jul 14, 2026 |
| Microsoft | Windows 11 Version 26H1 for ARM64-based Systems | 28000.2525 | [KB5101649](https://patchblox.com/security/data/fix/microsoft/kb5101649.md) | Jul 14, 2026 |
| Microsoft | Windows 11 version 26H1 for x64-based Systems | 28000.2525 | [KB5101649](https://patchblox.com/security/data/fix/microsoft/kb5101649.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2016 | 14393.9339 | [KB5099535](https://patchblox.com/security/data/fix/microsoft/kb5099535.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.9339 | [KB5099535](https://patchblox.com/security/data/fix/microsoft/kb5099535.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2019 | 17763.9020 | [KB5099538](https://patchblox.com/security/data/fix/microsoft/kb5099538.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.9020 | [KB5099538](https://patchblox.com/security/data/fix/microsoft/kb5099538.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2022 | 20348.5386 | [KB5099540](https://patchblox.com/security/data/fix/microsoft/kb5099540.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2025 | 26100.33158 | [KB5099536](https://patchblox.com/security/data/fix/microsoft/kb5099536.md) | Jul 14, 2026 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.33158 | [KB5099536](https://patchblox.com/security/data/fix/microsoft/kb5099536.md) | Jul 14, 2026 |

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Data as of 2026-11-07T18:46:35Z 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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