CVE-2026-88137

Analyzed Analyzed - Analysis Complete

WebDAV Information Disclosure Vulnerability

Publication date: 2026-10-13

Last updated on: 2026-10-31

Assigner: Microsoft Corporation

Description

Files or directories accessible to external parties in WebDAV allows an authorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-31

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-88137

EUVD

EUVD-2026-99658

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-552	The product makes files or directories accessible to unauthorized actors, even though they should not be.

Attack-Flow Graph

Executive Summary

This vulnerability involves files or directories accessible via WebDAV that can be viewed by unauthorized external parties. An attacker with valid credentials can exploit this to access sensitive information over a network.

Detection Guidance

Check WebDAV server logs for unauthorized access attempts or unusual file access patterns. Use network monitoring tools like Wireshark to inspect HTTP/WebDAV traffic for sensitive data exposure. Ensure WebDAV directories are not exposed to external networks without authentication.

Impact Analysis

An attacker could steal confidential data such as documents, credentials, or configuration files. This may lead to further attacks like data breaches or unauthorized system access.

Compliance Impact

This vulnerability could violate data protection laws like GDPR or HIPAA by exposing sensitive personal or health information. Organizations may face legal penalties, fines, or reputational damage.

Mitigation Strategies

Disable WebDAV if not required. Restrict WebDAV directory permissions to authorized users only. Apply the latest security updates from Microsoft. Monitor network traffic for suspicious WebDAV requests and block external access to WebDAV ports if possible.

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