CVE-2026-40366
Microsoft Word Remote Code Execution Vulnerability
Severity Score
8.4
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track*
*SSVC
Descriptions
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track*
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2026-04-11 CVE Reserved
- 2026-05-12 CVE Published
- 2026-05-13 EPSS Updated
- 2026-05-14 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-416: Use After Free
CAPEC
References (1)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40366 | 2026-05-13 |
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Microsoft Search vendor "Microsoft" | Microsoft Office LTSC For Mac 2021 Search vendor "Microsoft" for product "Microsoft Office LTSC For Mac 2021" | >= 16.0.1 < 16.109.26051019 Search vendor "Microsoft" for product "Microsoft Office LTSC For Mac 2021" and version " >= 16.0.1 < 16.109.26051019" | en |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Microsoft Office LTSC For Mac 2024 Search vendor "Microsoft" for product "Microsoft Office LTSC For Mac 2024" | >= 16.0.0 < 16.109.26051019 Search vendor "Microsoft" for product "Microsoft Office LTSC For Mac 2024" and version " >= 16.0.0 < 16.109.26051019" | en |
Affected
| ||||||
| Microsoft Search vendor "Microsoft" | Microsoft Word 2016 Search vendor "Microsoft" for product "Microsoft Word 2016" | >= 16.0.1.0 < 16.0.5552.1000 Search vendor "Microsoft" for product "Microsoft Word 2016" and version " >= 16.0.1.0 < 16.0.5552.1000" | en |
Affected
| ||||||