CVE-2026-40367

Published: May 12, 2026

Modified: Jun 2, 2026

PUBLISHED

CVSS v3.1

8.4

HIGH

Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Vendor	Product	Versions
Microsoft	Microsoft 365 Apps for Enterprise	affected `16.0.1 - < https://aka.ms/OfficeSecurityReleases`
Microsoft	Microsoft Office 2019	affected `19.0.0 - < https://aka.ms/OfficeSecurityReleases`
Microsoft	Microsoft Office LTSC 2021	affected `16.0.1 - < https://aka.ms/OfficeSecurityReleases`
Microsoft	Microsoft Office LTSC 2024	affected `16.0.0 - < https://aka.ms/OfficeSecurityReleases`
Microsoft	Microsoft Office LTSC for Mac 2021	affected `16.0.1 - < 16.109.26051019`
Microsoft	Microsoft Office LTSC for Mac 2024	affected `16.0.0 - < 16.109.26051019`
Microsoft	Microsoft SharePoint Enterprise Server 2016	affected `16.0.0 - < 16.0.5552.1002`
Microsoft	Microsoft SharePoint Server 2019	affected `16.0.0 - < 16.0.10417.20128`
Microsoft	Microsoft SharePoint Server Subscription Edition	affected `16.0.0 - < 16.0.19725.20280`
Microsoft	Microsoft Word 2016	affected `16.0.1 - < 16.0.5552.1000`

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

vendor-advisory

patch

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