CVE-2026-62775

Analyzed Analyzed - Analysis Complete

Incorrect Authorization in Windows Container Isolation FS Filter Driver

Publication date: 2026-08-11

Last updated on: 2026-08-13

Assigner: Microsoft Corporation

Description

Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-13

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-62775

EUVD

EUVD-2026-56659

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability involves incorrect authorization in the Windows Container Isolation FS Filter Driver (unionfs.sys). An authorized attacker can exploit this to disclose information locally on the affected system.

Detection Guidance

This vulnerability involves incorrect authorization in the Windows Container Isolation FS Filter Driver. Detection requires checking for unauthorized information disclosure on systems running affected Windows versions. Use Windows Event Viewer to inspect logs for unusual activity in unionfs.sys or container isolation components. No specific commands are provided in the available resources.

Impact Analysis

An attacker with local access could exploit this to read sensitive information from the system, potentially leading to unauthorized data access or further attacks.

Compliance Impact

This vulnerability could lead to unauthorized information disclosure, which may violate data protection requirements under GDPR or HIPAA if sensitive data is exposed.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Container Isolation FS Filter Driver (unionfs.sys). Monitor Microsoft's update guide for patches and install them promptly.

Hi! I’m here to help you understand CVE-2026-62775. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70