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MEDIUM · 4.3

CVE-2026-40421

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

Vulnerability Description

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

CVSS Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE

Affected Products

VendorProductVersions
Microsoft365 Apps-
MicrosoftOffice2019
MicrosoftOffice Long Term Servicing Channel2021
MicrosoftWord2016

Related Weaknesses (CWE)

CWE-73

References

FAQ

What is CVE-2026-40421?

CVE-2026-40421 is a vulnerability with a CVSS score of 4.3 (MEDIUM). External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

How severe is CVE-2026-40421?

CVE-2026-40421 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-40421?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft 365 Apps, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Word.