CVE-2026-81390 Advisory
Severity: MEDIUM (CVSS 5.5)
KEV Status: Not currently exploited
Affected Product:
- Microsoft Defender Business
Vulnerability: Out-of-bounds read in Microsoft Office Excel enabling local information disclosure.
Remediation: Review Microsoft Security Response Center guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81390 for patching instructions and availability.
Impact Assessment: Local attack vector with low complexity. No evidence of active exploitation at this time.