This vulnerability, tracked as CVE-2026-32189 and classified under CWE-416 (Use After Free), exists in Microsoft Office Excel as part of Microsoft 365 Apps for Enterprise. It enables an unauthorized attacker to execute code locally by exploiting a use-after-free condition. 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 confidentiality, integrity, and availability with high severity. Microsoft has issued an official fix and manages remediation for the cloud service. The affected version explicitly stated is 16.0.1.

Successful exploitation allows an unauthorized attacker to execute arbitrary code locally on the affected system, potentially leading to full compromise of confidentiality, integrity, and availability of the affected application environment.

An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should apply the official update as directed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32189 to mitigate this vulnerability.