CVE-2026-40367

Microsoft Word Remote Code Execution Vulnerability

CVE-2026-40367 is fixed in 5 products on 1 platform, first by KB5002868, released May 12, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

8.4

Critical

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0045

39th percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft SharePoint Enterprise Server 2016	KB5002869	May 20, 2026
Microsoft SharePoint Enterprise Server 2016	KB5002868	May 12, 2026
Microsoft SharePoint Server 2019	KB5002872	May 20, 2026
Microsoft SharePoint Server 2019	KB5002870	May 12, 2026
Microsoft SharePoint Server Subscription Edition	KB5002863	May 12, 2026
Microsoft Word 2016 (32-bit edition)	KB5002858	May 12, 2026
Microsoft Word 2016 (64-bit edition)	KB5002858	May 12, 2026

Details

Published
May 20, 2026
Weakness
Untrusted Pointer Dereference
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367

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