This vulnerability in Microsoft 365 Apps for Enterprise involves a use-after-free condition leading to a heap-based buffer overflow. Exploitation could allow an attacker to execute arbitrary code locally without user interaction or privileges. The issue is tracked as CVE-2026-45461 with a CVSS 3.1 score of 8.4 (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Microsoft has published an official fix and manages remediation for this cloud service. No known exploits are currently reported in the wild.

Successful exploitation of this vulnerability could result in local code execution with high impact on confidentiality, integrity, and availability of the affected system. Because it is a use-after-free leading to a heap-based buffer overflow, it may allow attackers to run arbitrary code, potentially leading to full system compromise.

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 Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45461 for detailed patching and mitigation instructions.