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CVE Vulnerability Details :
CVE-2026-40398
PUBLISHED
More InfoOfficial Page
Assigner-microsoft
Assigner Org ID-f38d906d-7342-40ea-92c1-6c4a2c6478c8
View Known Exploited Vulnerability (KEV) details
Published At-12 May, 2026 | 16:59
Updated At-13 May, 2026 | 03:56
Rejected At-
▼CVE Numbering Authority (CNA)
Windows Remote Desktop Services Elevation of Privilege Vulnerability

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

Affected Products
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 1607
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.14393.0 before 10.0.14393.9140 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 1809
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.17763.0 before 10.0.17763.8755 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 21H2
Platforms
  • 32-bit Systems
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.19044.0 before 10.0.19044.7291 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 22H2
Platforms
  • 32-bit Systems
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.19045.0 before 10.0.19045.7291 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 version 22H3
Platforms
  • ARM64-based Systems
Versions
Affected
  • From 10.0.22631.0 before 10.0.22631.7079 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 23H2
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.22631.0 before 10.0.22631.7079 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 24H2
Platforms
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.26100.0 before 10.0.26100.8457 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 25H2
Platforms
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.26200.0 before 10.0.26200.8457 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 version 26H1
Platforms
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.28000.0 before 10.0.28000.2113 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2012
Platforms
  • x64-based Systems
Versions
Affected
  • From 6.2.9200.0 before 6.2.9200.26079 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2012 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 6.2.9200.0 before 6.2.9200.26079 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2012 R2
Platforms
  • x64-based Systems
Versions
Affected
  • From 6.3.9600.0 before 6.3.9600.23181 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2012 R2 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 6.3.9600.0 before 6.3.9600.23181 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2016
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.14393.0 before 10.0.14393.9140 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2016 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.14393.0 before 10.0.14393.9140 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2019
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.17763.0 before 10.0.17763.8755 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2019 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.17763.0 before 10.0.17763.8755 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2022
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.20348.0 before 10.0.20348.5139 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2022, 23H2 Edition (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.25398.0 before 10.0.25398.2330 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2025
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.26100.0 before 10.0.26100.32860 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2025 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.26100.0 before 10.0.26100.32860 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-122CWE-122: Heap-based Buffer Overflow
Type: CWE
CWE ID: CWE-122
Description: CWE-122: Heap-based Buffer Overflow
Metrics
VersionBase scoreBase severityVector
3.17.8HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Version: 3.1
Base score: 7.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40398
vendor-advisory
patch
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40398
Resource:
vendor-advisory
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found