This vulnerability is a heap-based buffer overflow in Microsoft 365 Apps for Enterprise (version 16.0.1) that could allow an unauthorized attacker to execute code locally. The CVSS 3.1 vector indicates low attack complexity, no privileges required, and user interaction is needed. The impact includes high confidentiality, integrity, and availability impact. Microsoft has published an official fix and manages remediation for this cloud service. The vulnerability is tracked as CWE-122.

Successful exploitation could allow an attacker to execute arbitrary code locally, potentially leading to full compromise of the affected application environment. The vulnerability impacts confidentiality, integrity, and availability at a high level. However, no active exploitation has been reported.

An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise environments are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63519.