CVE-2026-83999— Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
Quick assessment
Affected
Microsoft Windows 11 Version 24H2
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.
Windows 弹性文件系统（ReFS）去重服务中，在文件访问之前未正确解析符号链接（即“链接跟随”问题），允许经过认证的本地攻击者提升权限。
Affected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0< 10.0.26100.9445 |
affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0< 10.0.26200.9445 |
affected |
| 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-2026-83999
Vulnerability Information
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Vulnerability Title
Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper link resolution before file access ('link following') in Windows Resilient File System (ReFS) Deduplication Service 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
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 ~ 10.0.26100.9445 | - |
|
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 ~ 10.0.26200.9445 | - |
|
| 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-2026-83999
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-83999 (1)
Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total
| CVE-2026-83941 | 9.9 CRITICAL | Entra ID Elevation of Privilege Vulnerability |
| CVE-2026-77493 | 9.8 CRITICAL | Windows Graphics Component Remote Code Execution Vulnerability |
| CVE-2026-69408 | 9.8 CRITICAL | Microsoft Windows Media Foundation Remote Code Execution Vulnerability |
| CVE-2026-69431 | 9.8 CRITICAL | Telnet Client Remote Code Execution Vulnerability |
| CVE-2026-69491 | 9.8 CRITICAL | Microsoft DirectMusic Remote Code Execution Vulnerability |
| CVE-2026-69463 | 9.8 CRITICAL | Windows NTFS Remote Code Execution Vulnerability |
| CVE-2026-69496 | 9.8 CRITICAL | Windows Compressed Folder Remote Code Execution Vulnerability |
| CVE-2026-69525 | 9.8 CRITICAL | Remote Desktop Services Remote Code Execution Vulnerability |
| CVE-2026-69819 | 9.8 CRITICAL | RPC Runtime Library Remote Code Execution Vulnerability |
| CVE-2026-69730 | 9.8 CRITICAL | Windows DNS Server Remote Code Execution Vulnerability |
| CVE-2026-69595 | 9.8 CRITICAL | Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability |
| CVE-2026-78445 | 9.8 CRITICAL | Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability |
| CVE-2026-73025 | 9.8 CRITICAL | Windows iSCSI Security Feature Bypass Vulnerability |
| CVE-2026-73010 | 9.8 CRITICAL | Microsoft Failover Cluster Remote Code Execution Vulnerability |
| CVE-2026-73009 | 9.8 CRITICAL | Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability |
| CVE-2026-72979 | 9.8 CRITICAL | Windows DHCP Server Remote Code Execution Vulnerability |
| CVE-2026-72982 | 9.8 CRITICAL | Windows Netlogon Remote Code Execution Vulnerability |
| CVE-2026-69824 | 9.8 CRITICAL | Microsoft Standard XPS Remote Code Execution Vulnerability |
| CVE-2026-68839 | 9.8 CRITICAL | Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability |
| CVE-2026-69768 | 9.8 CRITICAL | Windows RNDIS Remote Code Execution Vulnerability |
Showing top 20 of 966 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-83999
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