CVE-2026-50337 is a Windows Notification Elevation of Privilege vulnerability caused by incorrect type conversion or cast. Microsoft rates it as CVSS v3.1 7.8 (High) with a temporal score of 6.8. The attack vector is local, requires low privileges, and no user interaction. If successfully exploited, an attacker could gain SYSTEM privileges. Microsoft reports no public disclosure and no known exploitation, with exploit code maturity marked unproven. Because it is a local privilege escalation rather than a network-reachable issue, enterprise risk is highest where untrusted local access is possible.

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; local attack vector, LOW attack complexity, LOW privileges required, and NO user interaction
- Severity for enterprise: High severity on affected Windows systems, but risk is primarily local rather than remote; higher concern for environments where local code execution or user logon access is possible
- Patch status: available; customer action required

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 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025