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7.8
Windows Client Side Caching driver csc.sys Privilege Elevation Vulnerability
CVE-2026-26176
Summary
A flaw in the Windows Client Side Caching driver (csc.sys) could allow a hacker with access to the system to gain higher-level access than they normally should have. This could happen if a specific sequence of actions is taken on the system. To protect your system, apply the latest Windows updates as soon as possible.
Original title
Heap-based buffer overflow in Windows Client Side Caching driver (csc.sys) allows an authorized attacker to elevate privileges locally.
Original description
Heap-based buffer overflow in Windows Client Side Caching driver (csc.sys) allows an authorized attacker to elevate privileges locally.
nvd CVSS3.1
7.8
Vulnerability type
CWE-122
Heap-based Buffer Overflow
Published: 14 Apr 2026 · Updated: 14 Apr 2026 · First seen: 14 Apr 2026