# CVE-2025-55694: Windows Error Reporting Service Elevation of Privilege Vulnerability

CVE-2025-55694 is fixed in 7 products on 1 platform, first by KB5066835, released October 14, 2025. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2025-55694
- Priority: Urgent
- CVSS: 7.8 (Important)
- EPSS: 0.0325
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Oct 14, 2025
- Weakness: Improper Access Control
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55694

## Description

<p>Improper access control in Windows Error Reporting allows an authorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| 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, 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 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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