This vulnerability, identified as CVE-2026-50301, is a heap-based buffer overflow in Microsoft 365 Apps for Enterprise (version 16.0.1). It allows an unauthorized attacker to execute code locally on the affected system. The CVSS v3.1 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. Microsoft has officially fixed this vulnerability and manages remediation for this cloud-hosted service. The vendor advisory is available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50301.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code locally, potentially leading to full compromise of the affected system's confidentiality, integrity, and availability. However, exploitation requires local access and user interaction.

An official fix is available from Microsoft. Users and administrators should apply the provided update to Microsoft 365 Apps for Enterprise version 16.0.1 as per the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50301. Since this is a cloud service, Microsoft manages remediation server-side, but customers should verify that their environments are updated accordingly.