CVE-2026-97767: CWE-415: Double Free in Microsoft Microsoft 365 Apps for Enterprise

This vulnerability (CVE-2026-97767) involves a double free condition in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise. The flaw enables remote code execution by an unauthorized attacker over a network. The CVSS 3.1 base score is 8.8, indicating high severity, with network attack vector, low attack complexity, no privileges required, and user interaction required. Microsoft has released an official fix for affected versions. The vendor advisory is available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97767.

Successful exploitation allows an attacker to execute arbitrary code remotely with high impact on confidentiality, integrity, and availability. This could lead to full system compromise of the affected Microsoft 365 Apps for Enterprise installations.

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97767. Since this is a cloud service, Microsoft manages remediation for cloud-hosted components. No additional mitigation steps are specified.