CVE-2026-102217

Analyzed Analyzed - Analysis Complete

Improper Path Equivalence Resolution in WebDAV

Publication date: 2026-10-13

Last updated on: 2026-10-21

Assigner: Microsoft Corporation

Description

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

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-21

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-102217

EUVD

EUVD-2026-100372

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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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