CVE-2026-50680 - Windows Hyper-V Elevation of Privilege Vulnerability - is a heap-based buffer overflow in Windows Hyper-V that can lead to elevation of privilege to SYSTEM. Microsoft rates it as High severity with a CVSS v3.1 base score of 8.2 and temporal score of 7.1. The attack vector is LOCAL, with LOW attack complexity, HIGH privileges required, no user interaction, and changed scope. Microsoft reports no public disclosure and no known exploitation, and exploit code maturity is UNPROVEN. Because this is a local privilege escalation issue rather than a network-facing flaw, the enterprise risk is concentrated on systems where attackers can already obtain local access.

Highlights:
- CVSS scores: Base 8.2 - Temporal 7.1
- Exploit status & code maturity: Publicly Disclosed: No; Exploited: No; Exploit Code Maturity: UNPROVEN.
- Impact: Elevation of Privilege; confidentiality, integrity, and availability impacts are HIGH.
- Exploitation likelihood: Exploitation Less Likely; LOCAL vector, LOW attack complexity, HIGH privileges required, and no user interaction reduce remote exposure.
- Severity for enterprise: High technical severity, but lower immediate enterprise exposure than network-reachable issues because exploitation requires local access and elevated existing privileges.
- Patch status: available

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