CVE-2026-20839
Unknown Unknown - Not Provided
Improper Access Control in Windows CSC Service Enables Local Data Disclosure

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description
Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.
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Meta Information
Published
2026-01-13
Last Modified
2026-01-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20839
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_client-side_caching_service *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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Executive Summary

This vulnerability is an improper access control issue in the Windows Client-Side Caching (CSC) Service that allows an authorized attacker to disclose information locally. [1]

Impact Analysis

An authorized attacker could exploit this vulnerability to disclose sensitive information on the local system, potentially leading to information leakage. [1]

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