# CVE-2026-35433: .NET Elevation of Privilege Vulnerability

CVE-2026-35433 is fixed in 31 products on 2 platforms, first by KB5093446, released May 12, 2026. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-35433
- Priority: High
- CVSS: 7.3 (Important)
- EPSS: 0.0077
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: May 12, 2026
- Weakness: Improper Input Validation
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35433

## Description

<p>Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | .NET 10.0 runtime installed on Windows |  | [KB5093446](https://patchblox.com/security/data/fix/microsoft/kb5093446.md) | May 12, 2026 |
| Microsoft | .NET 8.0 runtime installed on Windows |  | [KB5093447](https://patchblox.com/security/data/fix/microsoft/kb5093447.md) | May 12, 2026 |
| Microsoft | .NET 9.0 runtime installed on Windows |  | [KB5093448](https://patchblox.com/security/data/fix/microsoft/kb5093448.md) | May 12, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems |  | [KB5087061](https://patchblox.com/security/data/fix/microsoft/kb5087061.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems |  | [KB5087061](https://patchblox.com/security/data/fix/microsoft/kb5087061.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems |  | [KB5087066](https://patchblox.com/security/data/fix/microsoft/kb5087066.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems |  | [KB5087066](https://patchblox.com/security/data/fix/microsoft/kb5087066.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5087064](https://patchblox.com/security/data/fix/microsoft/kb5087064.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems |  | [KB5087064](https://patchblox.com/security/data/fix/microsoft/kb5087064.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems |  | [KB5087064](https://patchblox.com/security/data/fix/microsoft/kb5087064.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems |  | [KB5087064](https://patchblox.com/security/data/fix/microsoft/kb5087064.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 |  | [KB5087068](https://patchblox.com/security/data/fix/microsoft/kb5087068.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5087053](https://patchblox.com/security/data/fix/microsoft/kb5087053.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems |  | [KB5087053](https://patchblox.com/security/data/fix/microsoft/kb5087053.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems |  | [KB5087058](https://patchblox.com/security/data/fix/microsoft/kb5087058.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems |  | [KB5087058](https://patchblox.com/security/data/fix/microsoft/kb5087058.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems |  | [KB5087054](https://patchblox.com/security/data/fix/microsoft/kb5087054.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems |  | [KB5087054](https://patchblox.com/security/data/fix/microsoft/kb5087054.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems |  | [KB5087051](https://patchblox.com/security/data/fix/microsoft/kb5087051.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems |  | [KB5087051](https://patchblox.com/security/data/fix/microsoft/kb5087051.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems |  | [KB5087055](https://patchblox.com/security/data/fix/microsoft/kb5087055.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H1 for x64-based Systems |  | [KB5087055](https://patchblox.com/security/data/fix/microsoft/kb5087055.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 |  | [KB5087059](https://patchblox.com/security/data/fix/microsoft/kb5087059.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 |  | [KB5087051](https://patchblox.com/security/data/fix/microsoft/kb5087051.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 on Windows Server 2012 |  | [KB5087048](https://patchblox.com/security/data/fix/microsoft/kb5087048.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 3.5 on Windows Server 2012 R2 |  | [KB5087049](https://patchblox.com/security/data/fix/microsoft/kb5087049.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems |  | [KB5087065](https://patchblox.com/security/data/fix/microsoft/kb5087065.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 4.8 on Windows Server 2012 |  | [KB5087067](https://patchblox.com/security/data/fix/microsoft/kb5087067.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 4.8 on Windows Server 2012 R2 |  | [KB5087063](https://patchblox.com/security/data/fix/microsoft/kb5087063.md) | May 18, 2026 |
| Microsoft | Microsoft .NET Framework 4.8 on Windows Server 2016 |  | [KB5087065](https://patchblox.com/security/data/fix/microsoft/kb5087065.md) | May 18, 2026 |
| Windows apps | Microsoft .NET Windows Desktop Runtime 8.0 | 8.0.30 | [Microsoft .NET Windows Desktop Runtime 8.0 8.0.30](https://patchblox.com/security/data/fix/windows-app/microsoft.dotnet.desktopruntime.8-8.0.30.md) | Jul 23, 2026 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Microsoft Windows Desktop Runtime - 8.0.25 (arm64) | no-fix |
| Windows apps | Microsoft Windows Desktop Runtime - 8.0.25 (x64) | no-fix |
| Windows apps | Microsoft Windows Desktop Runtime - 8.0.25 (x86) | no-fix |

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Data as of 2026-11-09T01:18:40Z 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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