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CVE-2026-40421

MEDIUMCVSS 4.3/10EPSS 0.62%

Last modified

CVE-2026-40421 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1
4.3/10

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

EPSS Probability
0.62%

45.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Microsoft365 AppsAll versions
MicrosoftOffice2019
MicrosoftOffice2024
MicrosoftOffice Long Term Servicing Channel2021
MicrosoftWord2016

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2026-40421?
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
How severe is CVE-2026-40421?
CVE-2026-40421 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.
How do I fix CVE-2026-40421?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40421?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST