CVE-2026-20817

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

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

I

mproper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	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_2022::::::::
	cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::
	cpe:2.3:o:microsoft:windows_server_2025::::::::

History

14 Jan 2026, 20:31

Type	Values Removed	Values Added
First Time		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 25h2 Microsoft windows 11 23h2 Microsoft windows Server 2022 23h2 Microsoft windows 11 24h2 Microsoft windows Server 2022 Microsoft Microsoft windows Server 2025
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817 - Vendor Advisory
CPE		cpe:2.3:o:microsoft:windows_11_25h2:::::::: cpe:2.3:o:microsoft:windows_server_2022:::::::: cpe:2.3:o:microsoft:windows_server_2025:::::::: cpe:2.3:o:microsoft:windows_server_2022_23h2:::::::: 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::::::::

13 Jan 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-13 18:16

Updated : 2026-01-14 20:31

NVD link : CVE-2026-20817

Mitre link : CVE-2026-20817

CVE.ORG link : CVE-2026-20817

JSON object : View

Products Affected

CWE

CWE-280

Improper Handling of Insufficient Permissions or Privileges

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