CVE-2026-85875: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise

CVE-2026-85875 is a CWE-125 out-of-bounds read vulnerability affecting Microsoft Office Excel in Microsoft 365 Apps for Enterprise. The vulnerability enables an unauthorized attacker to disclose information locally by reading memory outside the intended bounds. The CVSS 3.1 base score is 5.5, reflecting a medium severity with local attack vector, low attack complexity, no privileges required, and user interaction needed. Microsoft has published an official fix and manages remediation for this cloud service. No active exploitation has been reported.

An attacker can leverage this vulnerability to read memory outside the intended boundaries in Microsoft Excel, potentially disclosing sensitive local information. The impact is limited to information disclosure without integrity or availability effects. The attack requires local access and user interaction.

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 directed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85875 to mitigate this vulnerability.