CVE-2026-81388 Advisory
Severity: HIGH (CVSS 7.8)
Affected Product:
- Microsoft Defender Business
Vulnerability Description: Stack-based buffer overflow in Microsoft Office Excel allows local code execution.
KEV Status: Not currently exploited in the wild.
Remediation: Apply security updates from Microsoft. Refer to the official advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81388 for patch availability and deployment guidance.
Risk Level for IT Teams: Prioritize patching to prevent local privilege escalation and code execution scenarios.