Vulnerability · Published May 12, 2026 · Assigned by microsoft
CVE-2026-40364Microsoft Word Remote Code Execution Vulnerability
High 8.4
In plain English
A high-severity type confusion in Microsoft 365 Apps for Enterprise from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.4% (higher than 91% of all known vulnerabilities).
Severity (CVSS 3.1)8.4High
Exploit odds (30 days)4.4%top 8.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 2019 | 19.0.0 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 – before 16.109.26051019 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 – before 16.109.26051019 |
| Microsoft | Microsoft Word 2016 | 16.0.1 – before 16.0.5552.1000 |
Weakness: CWE-843, CWE-908, CWE-122 · 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
References
- Microsoft Word Remote Code Execution Vulnerability vendor-advisory, patch