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CVE-2026-69617— Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

Quick assessment

Affected

Microsoft Windows 11 version 26H1

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows Resilient File System是美国Microsoft公司的一款具有数据完整性校验与自动修复能力的文件系统。 Microsoft Windows Resilient File System存在缓冲区错误漏洞，该漏洞源于Windows Resilient File System (ReFS)存在越界读取，可能导致授权攻击者在本地提升权限。

CVSS 7.0 · High EPSS 0.26% · P18 Updated Oct 15, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1548 · Abuse Elevation Control Mechanism

Affected Version Matrix 3

Vendor	Product	Version Range	Status
Microsoft	Windows 11 version 26H1	`10.0.28000.0< 10.0.28000.2954`	affected
Microsoft	Windows Server 2025	`10.0.26100.0< 10.0.26100.33438`	affected
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0< 10.0.26100.33438`	affected

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I. Basic Information for CVE-2026-69617

Vulnerability Information

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Vulnerability Title

Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Out-of-bounds read in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存读

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft Windows Resilient File System 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Microsoft	Windows 11 version 26H1	10.0.28000.0 ~ 10.0.28000.2954	-
Microsoft	Windows Server 2025	10.0.26100.0 ~ 10.0.26100.33438	-
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 ~ 10.0.26100.33438	-

II. Public POCs for CVE-2026-69617

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-69617

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Vendor Advisories for CVE-2026-69617 (1)

🔗 CVE-2026-69617 - Security Update Guide - Microsoft - Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2026-69617

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

CVE-2026-83941	9.9 CRITICAL	Entra ID Elevation of Privilege Vulnerability
CVE-2026-69845	9.8 CRITICAL	Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69769	9.8 CRITICAL	Windows HTTP Print Provider Remote Code Execution Vulnerability
CVE-2026-69829	9.8 CRITICAL	Windows Shell Remote Code Execution Vulnerability
CVE-2026-69496	9.8 CRITICAL	Windows Compressed Folder Remote Code Execution Vulnerability
CVE-2026-69910	9.8 CRITICAL	Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-69595	9.8 CRITICAL	Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-69768	9.8 CRITICAL	Windows RNDIS Remote Code Execution Vulnerability
CVE-2026-69730	9.8 CRITICAL	Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-72979	9.8 CRITICAL	Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-72983	9.8 CRITICAL	Internet Connection Sharing (ICS) Remote Code Execution Vulnerability
CVE-2026-69276	9.8 CRITICAL	Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability
CVE-2026-78445	9.8 CRITICAL	Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-69525	9.8 CRITICAL	Remote Desktop Services Remote Code Execution Vulnerability
CVE-2026-69824	9.8 CRITICAL	Microsoft Standard XPS Remote Code Execution Vulnerability
CVE-2026-77493	9.8 CRITICAL	Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-69586	9.8 CRITICAL	Microsoft Windows PDF Remote Code Execution Vulnerability
CVE-2026-67631	9.8 CRITICAL	Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-69715	9.8 CRITICAL	Windows Direct Show Remote Code Execution Vulnerability
CVE-2026-72982	9.8 CRITICAL	Windows Netlogon Remote Code Execution Vulnerability

Showing top 20 of 966 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 11 version 26H1

Same vendor: Microsoft

Same weakness: CWE-125