CVE-2026-40421

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

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS

0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-26)

CWE

CWE-73

Published

2026-05-12

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• microsoft:365_apps
• microsoft:office
• microsoft:office_long_term_servicing_channel
• microsoft:word

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421

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