Windows NTFS Elevation of Privilege Vulnerability
Plan PatchCVSS 7CVE-2026-69915Oct 13, 2026
Microsoft
IT in OT - Windows Server and Active Directory are widely deployed in OT environments
Attack path
Attack VectorLocal
Auth RequiredLow
ComplexityHigh
User InteractionNone needed
Summary
A use-after-free vulnerability in Windows NTFS allows a logged-in user to elevate their privileges to administrator level without providing admin credentials. The flaw exists in how the NTFS driver manages memory when processing file system requests. Microsoft has rated exploitation as unlikely and recommends applying the October 2026 security update.
What this means
What could happen
A user with login access to a Windows machine could exploit a memory handling flaw in NTFS to gain administrator privileges, potentially allowing them to modify system configuration, access sensitive data, or interfere with software running on that device.
Who's at risk
Windows administrators and IT teams managing Windows 10, Windows 11, and Windows Server 2019, 2022, and 2025 systems in municipal, utility, or enterprise environments. This affects all deployed Windows endpoints, including servers, workstations, and thin clients, regardless of their role in the organization.
How it could be exploited
An attacker with a valid user account on a Windows machine could trigger a use-after-free condition in the NTFS driver by crafting a malicious file system request. Once successful, the attacker would execute code with administrator-level permissions without needing to provide admin credentials.
Prerequisites
- Valid user account (standard or elevated) on a Windows system with NTFS volumes
- Local access to the Windows machine (physical or remote desktop/console access)
- Ability to create or manipulate files on an NTFS volume
Local privilege escalation only (requires existing login)Low complexity exploitationAffects multiple Windows versions across 10+ years of releases
Exploitability
Unlikely to be exploited — EPSS score 0.3%
Affected products (24)
24 with fix
ProductAffected VersionsFix Status
Remediation & Mitigation
0/3
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXApply the October 2026 Windows security update to your Windows 10, Windows 11, and Windows Server systems
Long-term hardening
0/2HARDENINGVerify that all user accounts with local access use strong passwords and follow the principle of least privilege (no unnecessary administrator assignments)
HARDENINGEnable Windows Defender or third-party antimalware to monitor for suspicious file system manipulation attempts
CVEs (1)
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