SB20260415102 - Privilege escalation in Microsoft Windows Client Side Caching driver (csc.sys)
Published: April 15, 2026
Security Bulletin ID
SB20260415102
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-26176)
The vulnerability allows a local user to eescalate privileges on the system.
The vulnerability exists due to a boundary error in Windows Client Side Caching driver (csc.sys). A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow andgain elevated privileges on the target system.
Remediation
Install update from vendor's website.