CVE-2026-40359

HIGH

Microsoft Excel Remote Code Execution Vulnerability

Title source: cna
STIX 2.1

Description

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Excel Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40359

Scores

CVSS v3 7.8
EPSS 0.0006
EPSS Percentile 19.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (14)
microsoft/365_apps (2 CPE variants)
microsoft/excel 2016 (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Excel 2016 16.0.0.0 - 16.0.5552.1000
Microsoft/Microsoft Office 2019 19.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2021 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2024 16.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC for Mac 2021 16.0.1 - 16.109.26051019
Microsoft/Microsoft Office LTSC for Mac 2024 16.0.0 - 16.109.26051019
microsoft/office 2019 (2 CPE variants)
... and 4 more
Published May 12, 2026
Tracked Since May 12, 2026