# CVE-2025-55331: Windows PrintWorkflowUserSvc Elevation of Privilege Vulnerability

CVE-2025-55331 is fixed in 19 products on 1 platform, first by KB5066791, released October 14, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-55331
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0035
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Oct 14, 2025
- Weakness: Use After Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55331

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 21H2 for 32-bit Systems |  | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 |
| Microsoft | Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 |
| Microsoft | Windows 10 Version 21H2 for x64-based Systems |  | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 |
| Microsoft | Windows 10 Version 22H2 for 32-bit Systems |  | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 |
| Microsoft | Windows 10 Version 22H2 for ARM64-based Systems |  | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 |
| Microsoft | Windows 10 Version 22H2 for x64-based Systems |  | [KB5066791](https://patchblox.com/security/data/fix/microsoft/kb5066791.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 22H2 for ARM64-based Systems |  | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 22H2 for x64-based Systems |  | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems |  | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems |  | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 25H2 for ARM64-based Systems |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 25H2 for x64-based Systems |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2022 | 20348.4294 | [KB5066782](https://patchblox.com/security/data/fix/microsoft/kb5066782.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.4294 | [KB5066782](https://patchblox.com/security/data/fix/microsoft/kb5066782.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1913 | [KB5066780](https://patchblox.com/security/data/fix/microsoft/kb5066780.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2025 |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |

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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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