CVE-2026-85343

Undergoing Analysis Undergoing Analysis - In Progress

Improper Link Resolution Leading to Privilege Escalation in Windows Hyper-V

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Improper link resolution before file access ('link following') in Windows Hyper-V allows an authorized attacker to elevate privileges 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-2026-85343

EUVD

EUVD-2026-99476

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
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 2012 6.2.9200.0
Microsoft	Windows	Server 2012 (Server Core installation) 6.2.9200.0
Microsoft	Windows	Server 2012 R2 6.3.9600.0
Microsoft	Windows	Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
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-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 is a local elevation of privilege vulnerability in Windows Hyper-V. It occurs due to improper link resolution before file access, allowing an authorized attacker to gain higher privileges on the system.

Impact Analysis

An attacker with local access could exploit this to elevate their privileges, potentially gaining control over the system or accessing sensitive data.

Compliance Impact

This vulnerability allows local privilege escalation in Windows Hyper-V, which could lead to unauthorized access to sensitive data or system control. For GDPR, this may violate principles of data protection and security. For HIPAA, it could compromise protected health information integrity and confidentiality.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Hyper-V link following vulnerability. Monitor Microsoft's update guide for patches and install them as soon as available.

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