This vulnerability (CVE-2026-40418) involves a use-after-free condition in Microsoft 365 Apps for Enterprise, which can be exploited by an authorized local attacker to elevate their privileges. The CVSS 3.1 vector indicates the attack requires local access with low complexity and privileges, no user interaction, and results in high confidentiality, integrity, and availability impact. Microsoft has published an official fix and manages remediation for this cloud service. The affected version explicitly stated is 16.0.1.

An authorized local attacker could exploit this use-after-free vulnerability to elevate privileges, potentially gaining higher access rights than intended. The impact affects confidentiality, integrity, and availability at a high level. There are no known active exploits in the wild currently.

An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40418 for detailed patching and mitigation instructions.