CVE-2026-108442: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise

This vulnerability (CVE-2026-108442) involves a use-after-free condition in Microsoft Office Word, part of Microsoft 365 Apps for Enterprise. It enables remote code execution by an unauthorized attacker over a network. The CVSS 3.1 base score is 8.8, indicating high severity with network attack vector, low attack complexity, no privileges required, and user interaction required. The vulnerability affects multiple versions of Microsoft 365 Apps for Enterprise, including =16.0.1, >=1.0.0 <16.114.26101123, >=16.0.1 <16.0.14334.20974, >=16.0.0 <16.0.17932.21056, and others as specified. Microsoft has released an official fix and manages remediation for this cloud service. No active exploitation has been reported.

Successful exploitation of this use-after-free vulnerability could allow an attacker to execute arbitrary code remotely with high impact on confidentiality, integrity, and availability. This could lead to full compromise of affected systems running vulnerable versions of Microsoft 365 Apps for Enterprise. However, 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 by Microsoft through their update channels. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108442 for detailed guidance.