Untrusted Pointer Dereference in Microsoft products - CVE-2026-40367

Vulnerability identifier: #VU131348

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-40367

CWE-ID: CWE-822

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to untrusted pointer dereference in Microsoft Word. A remote attacker can execute arbitrary code on the system.

Microsoft 365 Apps for Enterprise
Microsoft Office
Microsoft Word
Microsoft Office LTSC
Microsoft SharePoint Enterprise Server
Microsoft SharePoint Server
Microsoft SharePoint Server Subscription Edition

Install updates from vendor's website.

Microsoft Word - update to 16.0.5552.1000
Microsoft SharePoint Enterprise Server - update to 16.0.5552.1002
Microsoft SharePoint Server - update to 16.0.10417.20128
Microsoft SharePoint Server Subscription Edition - update to 16.0.19725.20280

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367

• Multiple vulnerabilities in Microsoft Word