CVE-2026-41091
Analyzed Analyzed - Analysis Complete

Microsoft Defender Link Following Local Privilege Escalation

Publication date: 2026-05-20

Last updated on: 2026-05-20

Assigner: Microsoft Corporation

Description
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to elevate privileges locally.

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Meta Information

Published
2026-05-20
Last Modified
2026-05-20
Generated
2026-06-30
AI Q&A
2026-05-20
EPSS Evaluated
2026-06-28
NVD
CVE-2026-41091
EUVD
EUVD-2026-31101

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft malware_protection_engine From 1.1.26030.3008 (inc) to 1.1.26040.8 (exc)

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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Impact Analysis

The impact of this vulnerability is an elevation of privilege, meaning an authorized attacker can gain higher-level permissions on the affected system. This can lead to full control over the system, compromising confidentiality, integrity, and availability.

Executive Summary

This vulnerability involves improper link resolution before file access, also known as 'link following', in Microsoft Defender. It allows an authorized attacker to elevate their privileges locally by exploiting how links are resolved before accessing files.

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