This vulnerability involves a heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver component of Windows 10 Version 1607. An authorized attacker with local access can exploit this flaw to elevate their privileges, potentially gaining higher system rights. The vulnerability is tracked as CVE-2026-20940 and classified under CWE-822, indicating improper handling of pointers leading to memory corruption. The CVSS v3.1 base score is 7.8, reflecting high severity with impacts on confidentiality, integrity, and availability. A patch has been made available by Microsoft to remediate this issue.

Successful exploitation of this vulnerability could allow a local attacker with authorized access to escalate privileges, potentially leading to full system compromise. The impact includes complete loss of confidentiality, integrity, and availability on the affected system. There are no known exploits in the wild at this time.

A patch is available for this vulnerability and should be applied promptly to affected systems running Windows 10 Version 1607 (build 10.0.14393.0). Administrators should obtain and deploy the official Microsoft update to remediate this issue. No additional vendor advisories specify alternative mitigations or indicate that no action is required.