CVE-2026-20826

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-20826
Concurrent execution using shared resource with improper synchronization ('race condition') in Tablet Windows User Interface (TWINUI) Subsystem allows an authorized attacker to elevate privileges locally.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20826 Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
History

17 Jun 2026, 10:17

Type Values Removed Values Added
Summary
  • (es) Ejecución concurrente utilizando un recurso compartido con sincronización inadecuada ('condición de carrera') en el subsistema de Interfaz de Usuario de Tablet Windows (TWINUI) permite a un atacante autorizado elevar privilegios localmente.

15 Jan 2026, 13:16

Type Values Removed Values Added
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20826 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20826 - Vendor Advisory
CPE cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
First Time Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2022
Microsoft
Microsoft windows Server 2016
Microsoft windows Server 2022 23h2
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 11 23h2
Microsoft windows 10 22h2
Microsoft windows Server 2019
Microsoft windows Server 2025

13 Jan 2026, 18:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-01-13 18:16

Updated : 2026-06-17 10:17

NVD link : CVE-2026-20826

Mitre link : CVE-2026-20826

CVE.ORG link : CVE-2026-20826

JSON object : View

Products Affected

microsoft

  • windows_11_25h2
  • windows_10_1607
  • windows_11_24h2
  • windows_10_1809
  • windows_11_23h2
  • windows_server_2016
  • windows_10_22h2
  • windows_server_2022_23h2
  • windows_10_21h2
  • windows_server_2022
  • windows_server_2019
  • windows_server_2025
CWE
CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')