CVE-2026-102217

Undergoing Analysis Undergoing Analysis - In Progress

Improper Path Equivalence Resolution in WebDAV

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Improper resolution of path equivalence in WebDAV allows an authorized attacker to elevate privileges over a network.

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-2026-102217

EUVD

EUVD-2026-100372

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-41	The product is vulnerable to file system contents disclosure through path equivalence. Path equivalence involves the use of special characters in file and directory names. The associated manipulations are intended to generate multiple names for the same object.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper handling of path equivalence in WebDAV, allowing an authorized attacker to escalate their privileges across a network. WebDAV is a protocol for managing files on remote servers.

Detection Guidance

Check for WebDAV services running on Windows systems using commands like 'sc query webclient' or 'Get-WindowsOptionalFeature -Online -FeatureName WebDAV' in PowerShell. Monitor network traffic for unusual WebDAV requests or privilege escalation patterns.

Impact Analysis

An attacker could exploit this to gain higher-level access on a system, potentially allowing them to read, modify, or delete sensitive data, install malware, or take control of the affected system.

Compliance Impact

This vulnerability allows unauthorized privilege escalation via WebDAV path resolution flaws. It could lead to unauthorized access to sensitive data, violating GDPR data protection requirements and HIPAA security rules for protected health information.

Mitigation Strategies

Disable WebDAV client service if not needed using 'sc stop webclient' and 'sc config webclient start=disabled'. Apply Microsoft security updates for affected Windows versions. Restrict network access to WebDAV ports (80, 443) via firewall rules.

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