CVE-2026-50412 is a Windows NTFS stack-based buffer overflow vulnerability that leads to elevation of privilege. Microsoft rates it at CVSS v3.1 base 7.8 (High) with a temporal score of 6.8; the vector is local, low attack complexity, low privileges required, no user interaction, and unchanged scope. Microsoft reports no public disclosure and no known exploitation, with exploit code maturity unproven. Because the attack is local rather than network-based, enterprise risk is primarily for systems where an attacker can already obtain local access.

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 with HIGH confidentiality, HIGH integrity, and HIGH availability impacts.
- Exploitation likelihood: Exploitation Less Likely; local vector, LOW attack complexity, LOW privileges required, and no user interaction required.
- Severity for enterprise: High severity by CVSS, but real-world enterprise exposure is lower than a network-facing issue because exploitation requires local access. Risk is more relevant on shared or multi-user Windows systems.
- 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