CVE-2026-50321 is a Windows USB Driver elevation of privilege vulnerability described as a concurrent execution race condition caused by improper synchronization. It has a CVSS v3.1 base score of 7.8 (High) and a temporal score of 6.8. The attack vector is LOCAL, attack complexity is LOW, privileges required are LOW, and user interaction is NONE. Microsoft lists no public disclosure and no known exploitation, with exploit code maturity UNPROVEN and exploitation unlikely. This is a local privilege escalation issue, so enterprise risk is primarily on systems where attackers can obtain local execution or access.

Highlights:
- CVSS scores: Base 7.8 - Temporal 6.8
- Exploit status & code maturity: Publicly Disclosed: No; Exploited: No; Exploit Code Maturity: UNPROVEN.
- Impact: Elevation of Privilege; confidentiality, integrity, and availability impacts are all HIGH.
- Exploitation likelihood: Exploitation Unlikely; LOCAL vector, LOW attack complexity, LOW privileges required, and NO user interaction.
- Severity for enterprise: High on affected Windows hosts because successful exploitation can elevate privileges, but the local-only vector makes it less relevant to internet-facing services.
- Patch status: available

Affected systems:
- Windows 10 1607
- Windows 10 1809
- Windows 10 21H2
- Windows 10 22H2
- Windows 11 24H2
- Windows 11 25H2
- Windows 11 26H1
- Windows 11 unspecified
- Windows Server 2012
- Windows Server 2012 R2
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025