CVE-2026-40421

MEDIUM

Microsoft Word Information Disclosure Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Word Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421

Scores

CVSS v3 4.3
EPSS 0.0005
EPSS Percentile 16.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-73
Status published
Products (11)
microsoft/365_apps (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 2019 19.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2021 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2024 16.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Word 2016 16.0.1 - 16.0.5552.1000
microsoft/office 2019 (2 CPE variants)
microsoft/office 2021 (2 CPE variants)
microsoft/office 2024 (2 CPE variants)
microsoft/office_long_term_servicing_channel 2021 (2 CPE variants)
... and 1 more
Published May 12, 2026
Tracked Since May 12, 2026