CVE-2026-20839 MEDIUM

CVE-2026-20839: Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability

Vendor Microsoft
Product Windows 10 Version 1607
Weakness CWE-284
Published January 13, 2026
Last update April 1, 2026
View on NVD All CVEs

CVSS base score

5.5/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.

Key dates

02Disclosure timeline

January 13, 2026 CVE published
April 1, 2026 Record updated