CVE-2026-70264

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Improper Link Resolution in Microsoft Defender

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Improper link resolution before file access ('link following') in Microsoft Defender 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

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70264

EUVD

EUVD-2026-100136

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	Defender 0

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This vulnerability is an improper link resolution issue in Microsoft Defender where an attacker with authorized access can exploit link following to disclose local information.

Impact Analysis

An authorized attacker could exploit this to access sensitive local information stored on the system through Microsoft Defender's improper link handling.

Compliance Impact

This vulnerability allows local information disclosure, which could lead to unauthorized access to sensitive data. For GDPR, this may violate principles of data protection and confidentiality. For HIPAA, it could compromise protected health information if accessed locally.

Mitigation Strategies

Apply the latest security update from Microsoft to patch the vulnerability in Defender. Monitor Microsoft's official advisory for updates and ensure Defender definitions are current.

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