CVE-2026-83864

Analyzed Analyzed - Analysis Complete

Improper Access Control in Windows NTFS Leads to Local Information Disclosure

Publication date: 2026-10-13

Last updated on: 2026-10-21

Assigner: Microsoft Corporation

Description

Improper access control in Windows NTFS 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

2026-10-21

Generated

2026-11-08

AI Q&A

2026-10-13

EPSS Evaluated

2026-11-07

NVD

CVE-2026-83864

EUVD

EUVD-2026-99393

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
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_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (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-290	This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

Attack-Flow Graph

Executive Summary

This vulnerability is an improper access control flaw in Windows NTFS that allows an authorized local attacker to disclose information. It does not require elevated privileges beyond basic user access.

Detection Guidance

Since this is an improper access control vulnerability in Windows NTFS, detection may require checking for unusual file access patterns or permissions. Use tools like icacls to review file permissions and access logs for suspicious activity. Monitor for unauthorized information disclosure attempts in system logs.

Impact Analysis

An attacker with local access could exploit this to read sensitive files or data they should not have permission to view. This could lead to unauthorized information disclosure on affected Windows systems.

Compliance Impact

This vulnerability allows local information disclosure due to improper access control in Windows NTFS. It may impact compliance by potentially exposing sensitive data, which could violate GDPR's data protection principles or HIPAA's confidentiality requirements if such data is subject to those regulations.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the NTFS improper access control vulnerability. Monitor Microsoft's security advisories for updates and ensure all affected systems are updated promptly.

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