CVE-2026-81396 Advisory
Severity: HIGH (CVSS 7.8)
Affected Product:
- Microsoft Defender Business
Vulnerability: Stack-based buffer overflow in Microsoft Office Excel allows local code execution.
KEV Status: Not listed as actively exploited
Remediation: Apply security updates from Microsoft. Refer to the official advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81396
Recommendation: Prioritize patching due to HIGH severity and local code execution risk.