CVE-2026-50484 is a Windows Kernel elevation of privilege vulnerability caused by a heap-based buffer overflow. Microsoft rates it High severity with a CVSS v3.1 base score of 7.8 and temporal score of 6.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The issue is local, requires low privileges, and no user interaction. Microsoft says there is no public disclosure or known exploitation, exploit code maturity is unproven, and customer action is required. If successfully exploited, an attacker could gain SYSTEM privileges. In enterprise terms, this is a high-impact local privilege escalation risk, more relevant to systems where untrusted local code or users can obtain a foothold.

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 Less Likely; the vector is LOCAL with LOW attack complexity, LOW privileges required, and NO user interaction.
- Severity for enterprise: High severity for affected Windows endpoints and servers, but not a network-exposed remote attack. Enterprise risk is greatest where attackers may already have local access or low-privilege footholds.
- 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