Microsoft Word Remote Code Execution Vulnerability
Published May 12, 2026
8.4
HIGHCVSS 3.1
EPSS 0.45%
Description
Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Affected products
-
- Version 16.0.1StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 19.0.0StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 16.0.1StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 16.0.0StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 16.0.1StatusaffectedConstraints<16.109.26051019
- Version
-
- Version 16.0.0StatusaffectedConstraints<16.109.26051019
- Version
-
- Version 16.0.0StatusaffectedConstraints<16.0.5552.1002
- Version
-
- Version 16.0.0StatusaffectedConstraints<16.0.10417.20128
- Version
-
- Version 16.0.0StatusaffectedConstraints<16.0.19725.20280
- Version
-
- Version 16.0.1StatusaffectedConstraints<16.0.5552.1000
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | n/a |
| ||||||
| Microsoft | Microsoft Office 2019 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC 2021 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC 2024 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC for Mac 2021 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC for Mac 2024 | n/a |
| ||||||
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | n/a |
| ||||||
| Microsoft | Microsoft SharePoint Server 2019 | n/a |
| ||||||
| Microsoft | Microsoft SharePoint Server Subscription Edition | n/a |
| ||||||
| Microsoft | Microsoft Word 2016 | n/a |
|
- n/a
- n/a
- 2019
- 2019
- 2021
- 2021
- 2021
- 2024
- 2024
- 2024
- < 16.0.19725.20280
- 2016
- 2019
- 2016
- 2016
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
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
1 other source (NVD) ▾
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed May 12, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.45% (0.00446) | 36.50th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.44% (0.00440) | 34.83th | v5 (v2026.06.15) |
| May 13, 2026 | 0.04% (0.00044) | 13.61th | v4 (v2025.03.14) |
References (1)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367 vendor-advisorypatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40367 | vendor-advisorypatchVendor Advisory |
Change history (0)
No recorded changes yet.