CVE-2026-97740: CWE-497: Exposure of Sensitive System Information to an Unauthorized Control Sphere in Microsoft Microsoft 365 Apps for Enterprise

This vulnerability (CVE-2026-97740) in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise, involves exposure of sensitive system information to an unauthorized control sphere, enabling an attacker to disclose information over a network. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, and high confidentiality impact with no integrity or availability impact. Microsoft has published an official fix and manages remediation for this cloud service. No active exploitation has been reported.

An attacker can disclose sensitive system information remotely without privileges but requires user interaction. The confidentiality impact is high, potentially exposing sensitive data. There is no impact on integrity or availability. No known exploits are currently active in the wild.

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 updates as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97740 to mitigate this vulnerability.