CVE-2026-44821 is a CWE-125 out-of-bounds read vulnerability in Microsoft 365 Apps for Enterprise (version 16.0.1). It allows an unauthorized attacker to disclose information locally by reading memory outside the intended bounds. The vulnerability has a CVSS 3.1 base score of 5.5 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N), indicating local attack vector with low complexity, no privileges required, user interaction needed, and high confidentiality impact. Microsoft has published an official fix and manages remediation for this cloud service. No known exploits are reported in the wild.

An attacker can cause an out-of-bounds read that leads to local information disclosure, compromising confidentiality. There is no impact on integrity or availability. The attack requires local access and user interaction, limiting remote exploitation potential.

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-2026-44821 to mitigate this vulnerability.