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OpenAdvisories
High · 8.4 CVE-2026-40358 EUVD-2026-29640GHSA-4qm9-v478-vh8f

Microsoft Office Remote Code Execution Vulnerability

Published May 12, 2026 · Updated Aug 10, 2026 · Assigned by microsoft

Description

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Affected products

VendorProductAffectedFixed
Microsoft Microsoft 365 Apps for Enterprise 16.0.1 – < https://aka.ms/OfficeSecurityReleases https://aka.ms/OfficeSecurityReleases
Microsoft Microsoft Office 2016 16.0.0 – < 16.0.5552.1000 16.0.5552.1000
Microsoft Microsoft Office 2019 19.0.0 – < https://aka.ms/OfficeSecurityReleases https://aka.ms/OfficeSecurityReleases
Microsoft Microsoft Office LTSC 2021 16.0.1 – < https://aka.ms/OfficeSecurityReleases https://aka.ms/OfficeSecurityReleases
Microsoft Microsoft Office LTSC 2024 16.0.0 – < https://aka.ms/OfficeSecurityReleases https://aka.ms/OfficeSecurityReleases
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1 – < 16.109.26051019 16.109.26051019
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0 – < 16.109.26051019 16.109.26051019

Advisories 3

References