CVE-2026-42989
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Improper Link Resolution in Winlogon Elevates Privileges

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: Microsoft Corporation

Description
Improper link resolution before file access ('link following') in Winlogon allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-42989
EUVD
EUVD-2026-35742
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft winlogon *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-59 The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
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Executive Summary

This vulnerability involves improper link resolution before file access, also known as 'link following', in the Winlogon component of Microsoft Windows.

It allows an authorized attacker to elevate their privileges locally by exploiting this flaw.

Impact Analysis

The vulnerability can lead to an elevation of privilege, meaning an attacker with some level of access can gain higher-level permissions on the affected system.

This can result in the attacker gaining control over sensitive system functions, potentially leading to full system compromise.

Mitigation Strategies

This vulnerability allows an authorized attacker to elevate privileges locally due to improper link resolution before file access in Winlogon.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as detailed in their official update guide.

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