CVE-2026-81391
Severity: MEDIUM (CVSS 5.5)
KEV Status: Not exploited in the wild
Affected Products:
- Microsoft Defender Business
Description: Use of uninitialized resource in Microsoft Office Excel allows unauthorized local disclosure of information.
Remediation: Apply updates from Microsoft. See official guidance: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81391
Impact: Local information disclosure only; no remote exploitation or authentication bypass.