CVE-2026-97761: CWE-121: Stack-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise

This vulnerability (CVE-2026-97761) is a stack-based buffer overflow in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise. It 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. The vulnerability affects versions =16.0.1, =1.0.0, >=16.0.0 <16.0.17932.21056, and =16.0.0. Microsoft has published an official fix and manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.

Successful exploitation allows an attacker to execute arbitrary code remotely on the affected system, potentially leading to full compromise of the application and underlying system. The vulnerability impacts confidentiality, integrity, and availability with high severity.

An official fix is available from Microsoft. Users and administrators should apply the provided patches as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97761. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Check the vendor advisory for confirmation and ensure updates are applied promptly.