CVE-2026-40421

Microsoft Word Information Disclosure Vulnerability

State: Published
Severity: 4.3 Medium
Published: May 12, 2026
Updated: Aug 10, 2026
Reserved: Apr 13, 2026

Description

Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-73 External Control of File Name or Path

Affected Products

Product	Versions
Microsoft 365 Apps for EnterpriseMicrosoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 2019Microsoft	19.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC 2021Microsoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC 2024Microsoft	16.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Word 2016Microsoft	16.0.1 to before 16.0.5552.1000Affected

References

Microsoft Word Information Disclosure Vulnerabilityvendor-advisorypatch

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