Medium October 14, 2026

CVE-2026-88153: Security Advisory

CVE-2026-88153 CVSS 6.5

Who it affects: See the summary below.
What to do: Apply the vendor's update in your next patch window.

CVE-2026-88153 Advisory

Severity: MEDIUM (CVSS 6.5)

Affected Product:

Microsoft Defender Business

Vulnerability: Out-of-bounds read in Microsoft Office Excel enables unauthorized information disclosure over a network.

KEV Status: Not currently listed as actively exploited.

Remediation: Apply available security updates from Microsoft. Refer to the official advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88153

Data as of October 14, 2026. Sources: nvd.nist.gov, msrc.microsoft.com. Figures are pulled from public vendor and security data and refreshed automatically.

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