CVE-2026-69285: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise

This vulnerability (CVE-2026-69285) is a heap-based buffer overflow in Microsoft Office components within Microsoft 365 Apps for Enterprise. It enables remote code execution by an unauthorized attacker over a network. The flaw affects several version ranges of Microsoft 365 Apps for Enterprise prior to the fixed versions indicated. Microsoft has published an official fix and manages remediation for this cloud service. The CVSS 3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability.

Successful exploitation allows an attacker to execute arbitrary code remotely without privileges, potentially leading to full compromise of affected systems. The vulnerability impacts confidentiality, integrity, and availability with high severity. No known active exploits have been reported.

An official fix is available from Microsoft. Users and administrators should apply the latest updates for Microsoft 365 Apps for Enterprise as provided by Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69285 for detailed update instructions.