CVE-2026-83764

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Incorrect Authorization in Windows Clipboard User Service

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Incorrect authorization in Windows Clipboard User Service allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83764

EUVD

EUVD-2026-99985

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect authorization issue in the Windows Clipboard User Service. An authorized attacker with local access can exploit it to disclose sensitive information.

Impact Analysis

An attacker could access clipboard data on your system, potentially exposing sensitive information like passwords, documents, or other confidential data stored in the clipboard.

Compliance Impact

This vulnerability allows unauthorized local disclosure of information due to incorrect authorization in the Windows Clipboard User Service. For GDPR, this could lead to unauthorized access to personal data, violating principles of data protection and user rights. For HIPAA, it may result in unauthorized disclosure of protected health information, compromising compliance with safeguards for sensitive data.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Clipboard User Service authorization issue. Monitor Microsoft's update guide for patches specific to affected Windows versions.

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