CVE-2026-40418 Details
Description
Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.
A use-after-free vulnerability has been identified in Microsoft Office Click-To-Run, allowing an authorized attacker to locally elevate privileges. This vulnerability affects multiple Office products, including Microsoft Office LTSC 2024, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, and others, across both 32-bit and 64-bit editions.
Users can download the security update for this vulnerability through the Microsoft Update Catalog. For Microsoft Office LTSC 2024, instructions are available on the Microsoft 365 Apps Security Updates page. Similar guidance can be found for Microsoft Office 2019.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40418 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft office | 2019 |
CPE
Remediation
| |
| microsoft office long term servicing channel | 2021 2024 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | CVE Modified | [email protected] |
| May 19, 2026 | Initial Analysis | [email protected] |
| May 12, 2026 | New CVE Received | [email protected] |