CVE-2026-50313 is a Windows NTFS heap-based buffer overflow that can lead to remote code execution. Microsoft lists a CVSS v3.1 base score of 7.8 (High) and a temporal score of 6.8, with attack vector LOCAL, attack complexity LOW, privileges required NONE, and user interaction REQUIRED. The issue affects Windows client and server versions in the product tree. Microsoft reports no public disclosure and no known exploitation, with exploit code maturity UNPROVEN and exploitation likelihood rated as less likely. Because the vector is local and requires user interaction, the enterprise risk is higher for systems where local code execution or user-assisted execution is plausible, but it is lower than a network-reachable, no-interaction issue.

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 CVSS severity, but lower enterprise exposure than network-based issues because exploitation is local and requires user interaction.
- 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