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Microsoft CVE-2026-40421

| EUVDEUVD-2026-29678 MEDIUM
External Control of File Name or Path (CWE-73)
2026-05-12 microsoft GHSA-m493-43x7-h3mj
Medium
Disputed · 4.3 NVD
Temporal: 3.8
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
ENISA EUVD
HIGH
qualitative
CIRCL (temporal)
3.8 LOW
cvss

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

1
CVE Published
May 12, 2026 - 16:58 nvd
MEDIUM 4.3

DescriptionCVE.org

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

Analysis

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

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CVE-2026-40421 vulnerability details – vuln.today

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