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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.8 MEDIUM
cvss
vuln.today AI
7.8 HIGH

Local, low-complexity EoP by an authenticated user (AV:L/AC:L/PR:L, UI:N); kernel-context compromise yields full C/I/A impact within an unchanged scope.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 20:24 vuln.today
CVE Published
Jul 14, 2026 - 17:07 nvd
HIGH 7.8

DescriptionCVE.org

Untrusted pointer dereference in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in Microsoft Windows Resilient File System (ReFS) lets an authenticated local attacker gain elevated (SYSTEM-level) privileges by triggering an untrusted pointer dereference in the ReFS driver. It affects a broad range of Windows 10, Windows 11, and Windows Server 2016-2025 builds. Microsoft has released a patch; there is no public exploit identified at time of analysis and it is not listed in CISA KEV, so risk is currently patch-and-move rather than emergency.

Technical ContextAI

ReFS (Resilient File System) is Microsoft's newer-generation filesystem, implemented as a kernel-mode driver and used primarily on Windows Server (Storage Spaces, backup targets, large data volumes) and available on modern Windows client editions. The root cause is CWE-822 (Untrusted Pointer Dereference): the driver dereferences a pointer whose value is derived from data the attacker can influence, rather than validating it against a trusted source. Because filesystem parsing runs in kernel context, a controlled dereference of attacker-influenced memory can corrupt kernel state and be steered into a privilege-escalation primitive. The CPE set confirms the affected surface spans Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2016 through 2025 including Server Core installations.

RemediationAI

Apply the Microsoft security update for your specific Windows/Windows Server build (Patch available per vendor advisory) - see https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50441 for the exact fixed build per SKU, as precise fixed version numbers are not included in the provided data. Because exploitation requires an existing local, authenticated foothold, meaningful compensating controls until patching is complete include restricting interactive and local logon rights on ReFS-hosting servers to trusted administrators, and enforcing least privilege so standard users cannot run arbitrary local code. Where operationally acceptable, hosting sensitive volumes on NTFS instead of ReFS removes exposure to this specific driver path, but that is a disruptive migration and only appropriate for new deployments, not a quick mitigation. Prioritize patching ReFS-enabled backup and storage servers where the driver is actively in use.

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CVE-2026-50441 vulnerability details – vuln.today

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