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Description

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

PUBLISHED Reserved 2026-04-13 | Published 2026-05-12 | Updated 2026-05-20 | Assigner microsoft




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C

Problem types

CWE-73: External Control of File Name or Path

Product status

16.0.1 (custom) before https://aka.ms/OfficeSecurityReleases
affected

19.0.0 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.1 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.0 (custom) before https://aka.ms/OfficeSecurityReleases
affected

16.0.1 (custom) before 16.0.5552.1000
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421 (Microsoft Word Information Disclosure Vulnerability) vendor-advisory patch

cve.org (CVE-2026-40421)

nvd.nist.gov (CVE-2026-40421)

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