CVE-2026-81392 Advisory
Severity: MEDIUM (CVSS 5.5)
Affected Product:
- Microsoft Defender Business
Vulnerability: Out-of-bounds read in Microsoft Office Excel component allows unauthorized local information disclosure.
KEV Status: Not listed as exploited in the wild
Remediation: Apply security updates from Microsoft. Refer to the official vulnerability guidance: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81392
Impact: Local attackers with system access may read sensitive information from Excel processes.