What is CVE-2026-40421?

CVE-2026-40421 is a security advisory published by Microsoft Security Response Center (MSRC) with Information Disclosure severity. Microsoft Word Information Disclosure Vulnerability

Which CVE IDs does CVE-2026-40421 cover?

CVE-2026-40421 covers the following CVE IDs: CVE-2026-40421. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40421?

CVE-2026-40421 has a CVSS v3 base score of 4.3, published by Microsoft Security Response Center (MSRC).

CVE-2026-40421Information DisclosureCVSS 4.3

Microsoft Word Information Disclosure Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40421 →

📋 Description

<p>External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.</p>