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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-78451 Microsoft Windows SCSI Class System File Elevation of Privilege Vulnerability New On this page  CVE-2026-78451  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Sep 8, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-78451  Impact Elevation of Privilege Max Severity Important Weakness CWE-822: Untrusted Pointer Dereference CVSS Source Microsoft Vector String CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Metrics CVSS:3.1 6.8 / 5.9  Base score metrics: 6.8 / Temporal score metrics: 5.9  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Physical Attack Complexity Low Privileges Required None User Interaction None Scope Unchanged Confidentiality High Integrity High Availability High   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Untrusted pointer dereference in Microsoft Windows SCSI Class System File allows an unauthorized attacker to elevate privileges with a physical attack. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges. Acknowledgements Thanatos Tian (HKPolyU) & wgg with Diffract Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: Sep 8, 2026 Windows 11 Version 24H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 24H2 for ARM64-based Systems, Content:, 1 link 5124008  Title: Download Security Update for Windows 11 Version 24H2 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.9445 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 Version 26H1 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 26H1 for ARM64-based Systems, Content:, 1 link 5124012  Title: Download Security Update for Windows 11 Version 26H1 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.28000.2954 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 version 26H1 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 version 26H1 for x64-based Systems, Content:, 1 link 5124012  Title: Download Security Update for Windows 11 version 26H1 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.28000.2954 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows Server 2025 - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2025, Content:, 1 link 5122871  Title: Download Security Update for Windows Server 2025, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.33438 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 Version 24H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 24H2 for x64-based Systems, Content:, 1 link 5124008  Title: Download Security Update for Windows 11 Version 24H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.9445 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 Version 23H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 23H2 for x64-based Systems, Content:, 1 link 5122880  Title: Download Security Update for Windows 11 Version 23H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.22631.7582 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 Version 25H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 25H2 for x64-based Systems, Content:, 1 link 5124008  Title: Download Security Update for Windows 11 Version 25H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26200.9445 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 Version 23H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 23H2 for ARM64-based Systems, Content:, 1 link 5122880  Title: Download Security Update for Windows 11 Version 23H2 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.22631.7582 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 11 Version 25H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 25H2 for ARM64-based Systems, Content:, 1 link 5124008  Title: Download Security Update for Windows 11 Version 25H2 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26200.9445 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows Server 2025 (Server Core installation) - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2025 (Server Core installation), Content:, 1 link 5122871  Title: Download Security Update for Windows Server 2025 (Server Core installation), Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.26100.33438 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 10 Version 22H2 for 32-bit Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 22H2 for 32-bit Systems, Content:, 1 link 5122878  Title: Download Security Update for Windows 10 Version 22H2 for 32-bit Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19045.7725 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 10 Version 22H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 22H2 for ARM64-based Systems, Content:, 1 link 5122878  Title: Download Security Update for Windows 10 Version 22H2 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19045.7725 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 10 Version 21H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 21H2 for x64-based Systems, Content:, 1 link 5122878  Title: Download Security Update for Windows 10 Version 21H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19044.7725 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 10 Version 22H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 22H2 for x64-based Systems, Content:, 1 link 5122878  Title: Download Security Update for Windows 10 Version 22H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19045.7725 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 10 Version 21H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 21H2 for ARM64-based Systems, Content:, 1 link 5122878  Title: Download Security Update for Windows 10 Version 21H2 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19044.7725 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows 10 Version 21H2 for 32-bit Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 21H2 for 32-bit Systems, Content:, 1 link 5122878  Title: Download Security Update for Windows 10 Version 21H2 for 32-bit Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.19044.7725 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026 Windows Server 2022 - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2022, Content:, 1 link 5122882  Title: Download Security Update for Windows Server 2022, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.20348.5622 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Sep 8, 2026