This vulnerability (CVE-2026-56189) involves a heap-based buffer overflow in the Windows Media Foundation component of Microsoft Windows 10 Version 1607 (build 10.0.14393.0). The flaw enables an unauthorized attacker to execute code locally, potentially leading to full system compromise. The CVSS 3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability rated high. Microsoft has released an official fix for this vulnerability as documented in their security update guide.

Successful exploitation allows an unauthorized local attacker to execute arbitrary code on the affected system, resulting in complete compromise of confidentiality, integrity, and availability of the system. This could lead to full control over the affected Windows 10 Version 1607 device.

An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56189 to remediate this vulnerability.