What is CVE-2026-40358?

CVE-2026-40358 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-2026-40358 cover?

CVE-2026-40358 covers the following CVE IDs: CVE-2026-40358. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40358?

CVE-2026-40358 has a CVSS v3 base score of 8.4, published by Microsoft Security Response Center (MSRC).

CVE-2026-40358Remote Code ExecutionCVSS 8.4

Microsoft Office Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-40358 →

📋 Description

<p>Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.</p>