CVE-2026-40398— Windows Remote Desktop Services Elevation of Privilege Vulnerability

CVSS 7.8 · High EPSS 0.03% · P8 Updated May 16, 2026

Affected Version Matrix 21

Vendor	Product	Version Range	Status
Microsoft	Windows 10 Version 1607	`10.0.14393.0< 10.0.14393.9140`	affected
Microsoft	Windows 10 Version 1809	`10.0.17763.0< 10.0.17763.8755`	affected
Microsoft	Windows 10 Version 21H2	`10.0.19044.0< 10.0.19044.7291`	affected
Microsoft	Windows 10 Version 22H2	`10.0.19045.0< 10.0.19045.7291`	affected
Microsoft	Windows 11 version 22H3	`10.0.22631.0< 10.0.22631.7079`	affected
Microsoft	Windows 11 Version 23H2	`10.0.22631.0< 10.0.22631.7079`	affected
Microsoft	Windows 11 Version 24H2	`10.0.26100.0< 10.0.26100.8457`	affected
Microsoft	Windows 11 Version 25H2	`10.0.26200.0< 10.0.26200.8457`	affected
Microsoft	Windows 11 version 26H1	`10.0.28000.0< 10.0.28000.2113`	affected
Microsoft	Windows Server 2012	`6.2.9200.0< 6.2.9200.26079`	affected
Microsoft	Windows Server 2012 (Server Core installation)	`6.2.9200.0< 6.2.9200.26079`	affected
Microsoft	Windows Server 2012 R2	`6.3.9600.0< 6.3.9600.23181`	affected
Microsoft	Windows Server 2012 R2 (Server Core installation)	`6.3.9600.0< 6.3.9600.23181`	affected
Microsoft	Windows Server 2016	`10.0.14393.0< 10.0.14393.9140`	affected
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0< 10.0.14393.9140`	affected
Microsoft	Windows Server 2019	`10.0.17763.0< 10.0.17763.8755`	affected
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0< 10.0.17763.8755`	affected
Microsoft	Windows Server 2022	`10.0.20348.0< 10.0.20348.5139`	affected
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	`10.0.25398.0< 10.0.25398.2330`	affected
Microsoft	Windows Server 2025	`10.0.26100.0< 10.0.26100.32860`	affected
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0< 10.0.26100.32860`	affected

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I. Basic Information for CVE-2026-40398

Vulnerability Information

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Vulnerability Title

Windows Remote Desktop Services Elevation of Privilege Vulnerability

Source: NVD (National Vulnerability Database)

Vulnerability Description

Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Source: NVD (National Vulnerability Database)

CVSS Information

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

Source: NVD (National Vulnerability Database)

Vulnerability Type

堆缓冲区溢出

Source: NVD (National Vulnerability Database)

Vulnerability Title

Microsoft Windows Remote Desktop Services 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Microsoft Windows Remote Desktop Services是美国微软（Microsoft）公司的一个允许用户远程访问图形桌面和Windows应用程序的功能集合。 Microsoft Windows Remote Desktop Services存在安全漏洞。攻击者利用该漏洞可以提升权限。以下产品和版本受到影响：Windows Server 2016,Windows Server 2016 (Server Core installation),Windows Server 2012,

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 10 Version 1607	10.0.14393.0 ~ 10.0.14393.9140	-
Microsoft	Windows 10 Version 1809	10.0.17763.0 ~ 10.0.17763.8755	-
Microsoft	Windows 10 Version 21H2	10.0.19044.0 ~ 10.0.19044.7291	-
Microsoft	Windows 10 Version 22H2	10.0.19045.0 ~ 10.0.19045.7291	-
Microsoft	Windows 11 version 22H3	10.0.22631.0 ~ 10.0.22631.7079	-
Microsoft	Windows 11 Version 23H2	10.0.22631.0 ~ 10.0.22631.7079	-
Microsoft	Windows 11 Version 24H2	10.0.26100.0 ~ 10.0.26100.8457	-
Microsoft	Windows 11 Version 25H2	10.0.26200.0 ~ 10.0.26200.8457	-
Microsoft	Windows 11 version 26H1	10.0.28000.0 ~ 10.0.28000.2113	-
Microsoft	Windows Server 2012	6.2.9200.0 ~ 6.2.9200.26079	-
Microsoft	Windows Server 2012 (Server Core installation)	6.2.9200.0 ~ 6.2.9200.26079	-
Microsoft	Windows Server 2012 R2	6.3.9600.0 ~ 6.3.9600.23181	-
Microsoft	Windows Server 2012 R2 (Server Core installation)	6.3.9600.0 ~ 6.3.9600.23181	-
Microsoft	Windows Server 2016	10.0.14393.0 ~ 10.0.14393.9140	-
Microsoft	Windows Server 2016 (Server Core installation)	10.0.14393.0 ~ 10.0.14393.9140	-
Microsoft	Windows Server 2019	10.0.17763.0 ~ 10.0.17763.8755	-
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 ~ 10.0.17763.8755	-
Microsoft	Windows Server 2022	10.0.20348.0 ~ 10.0.20348.5139	-
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	10.0.25398.0 ~ 10.0.25398.2330	-
Microsoft	Windows Server 2025	10.0.26100.0 ~ 10.0.26100.32860	-
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 ~ 10.0.26100.32860	-

II. Public POCs for CVE-2026-40398

#	POC Description	Source Link	Shenlong Link

AI-Generated POCPremium

No public POC found.

III. Intelligence Information for CVE-2026-40398

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https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40398vendor-advisorypatch
https://nvd.nist.gov/vuln/detail/CVE-2026-40398

Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total

CVE-2026-42898	9.9 CRITICAL	Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-42823	9.9 CRITICAL	Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-41089	9.8 CRITICAL	Windows Netlogon Remote Code Execution Vulnerability
CVE-2026-41096	9.8 CRITICAL	Windows DNS Client Remote Code Execution Vulnerability
CVE-2026-40379	9.3 CRITICAL	Azure Entra ID Spoofing Vulnerability
CVE-2026-40402	9.3 CRITICAL	Windows Hyper-V Elevation of Privilege Vulnerability
CVE-2026-42833	9.1 CRITICAL	Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-33117	9.1 CRITICAL	Azure SDK for Java Security Feature Bypass Vulnerability
CVE-2026-41103	9.1 CRITICAL	Microsoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability
CVE-2026-40403	8.8 HIGH	Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-40357	8.8 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-41109	8.8 HIGH	GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-35436	8.8 HIGH	Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-35439	8.8 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40420	8.8 HIGH	Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-41086	8.8 HIGH	Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability
CVE-2026-40365	8.8 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-34329	8.8 HIGH	Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
CVE-2026-33110	8.8 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40370	8.8 HIGH	SQL Server Remote Code Execution Vulnerability

Showing top 20 of 125 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607

Same vendor: Microsoft

Same weakness: CWE-122

V. Comments for CVE-2026-40398

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CVE-2026-40398— Windows Remote Desktop Services Elevation of Privilege Vulnerability

Affected Version Matrix 21

I. Basic Information for CVE-2026-40398

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-40398

III. Intelligence Information for CVE-2026-40398

Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-40398

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