What is CVE-2026-40363?

CVE-2026-40363 is a security advisory published by Microsoft Security Response Center (MSRC) with Remote Code Execution severity. Microsoft Office Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-40363 cover?

CVE-2026-40363 covers the following CVE IDs: CVE-2026-40363. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40363?

CVE-2026-40363 has a CVSS v3 base score of 8.4, published by Microsoft Security Response Center (MSRC).

CVE-2026-40363Remote Code ExecutionCVSS 8.4

Microsoft Office Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40363 →

📋 Description

<p>Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.</p>