CVE-2026-88151 Advisory
Vulnerability: Out-of-bounds read in Microsoft Office Excel
Affected Product:
- Microsoft Defender Business
Severity: MEDIUM (CVSS 6.5)
KEV Status: Not currently exploited in the wild
Description: An out-of-bounds read vulnerability in Microsoft Office Excel could allow an unauthorized attacker to disclose information over a network.
Remediation: Apply security updates from Microsoft. See: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88151
Action Required: Review systems running the affected product and apply patches when available.