CVE-2026-50362 is a Windows Resilient File System (ReFS) heap-based buffer overflow that can lead to remote code execution. Microsoft lists CVSS v3.1 base score 7.8 (High) and temporal score 6.8, with a LOCAL attack vector, LOW attack complexity, NO privileges required, and USER INTERACTION required. The issue has not been publicly disclosed or exploited, exploit code maturity is UNPROVEN, and Microsoft rates exploitation less likely. Because the attack is local and requires user interaction, it is lower risk than a network-reachable unauthenticated flaw, but it remains important for enterprise systems where users can be induced to interact with a malicious file or local content.

Highlights:
- CVSS scores: Base 7.8 - Temporal 6.8
- Exploit status & code maturity: Publicly Disclosed: No; Exploited: No; Exploit Code Maturity: UNPROVEN.
- Impact: Remote Code Execution with HIGH confidentiality, integrity, and availability impacts.
- Exploitation likelihood: Exploitation Less Likely; vector is LOCAL with LOW attack complexity, NO privileges required, and USER INTERACTION required.
- Severity for enterprise: High technical severity, but real-world exposure is reduced by the local-only vector and required user interaction. Risk is most relevant on endpoints and servers where users can open or process untrusted content.
- 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