May 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-40421 Published on May 12, 2026
Microsoft Word Information Disclosure Vulnerability
External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
Weakness Type
External Control of File Name or Path
The software allows user input to control or influence paths or file names that are used in filesystem operations.
Products Associated with CVE-2026-40421
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 19.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.1 and below 16.0.5552.1000 is affected.