CVE-2026-40367: CWE-822: Untrusted Pointer Dereference in Microsoft Microsoft 365 Apps for Enterprise
Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40367) is a type confusion flaw in Microsoft Office Word within Microsoft 365 Apps for Enterprise. It allows unauthorized local code execution by accessing resources with incompatible types. The CVSS 3.1 base score is 8.4, indicating high severity, with attack vector local, low attack complexity, no privileges required, and no user interaction needed. Microsoft has published an official fix and manages remediation for this cloud-hosted service. The affected version explicitly stated is 16.0.1.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code locally with high impact on confidentiality, integrity, and availability. This could lead to full compromise of the affected system. However, there are currently no known exploits in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should apply the official update as directed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367 to mitigate this vulnerability.
CVE-2026-40367: CWE-822: Untrusted Pointer Dereference in Microsoft Microsoft 365 Apps for Enterprise
Description
Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
CVSS v3.1
Score 8.4high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40367) is a type confusion flaw in Microsoft Office Word within Microsoft 365 Apps for Enterprise. It allows unauthorized local code execution by accessing resources with incompatible types. The CVSS 3.1 base score is 8.4, indicating high severity, with attack vector local, low attack complexity, no privileges required, and no user interaction needed. Microsoft has published an official fix and manages remediation for this cloud-hosted service. The affected version explicitly stated is 16.0.1.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code locally with high impact on confidentiality, integrity, and availability. This could lead to full compromise of the affected system. However, there are currently no known exploits in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should apply the official update as directed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367 to mitigate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-11T23:06:15.614Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367","vendor":"Microsoft"}]
Threat ID: 6a036550cbff5d861008c8f8
Added to database: 05/12/2026, 17:37:20 UTC
Last enriched: 06/19/2026, 17:36:55 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 71
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