SB20260113127 - Information disclosure in Microsoft Windows Client-Side Caching (CSC) Service
Published: January 13, 2026
Security Bulletin ID
SB20260113127
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper access control (CVE-ID: CVE-2026-20839)
The vulnerability allows a local user to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in Windows Client-Side Caching (CSC) Service. A local user can bypass implemented security restrictions and gain unauthorized access to sensitive information on the system.
Remediation
Install update from vendor's website.