CVE-2026-40359HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
🔗 CVE IDs covered (1)
📋 Description
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
🎯 Affected products13
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft Excel 2016 (32-bit edition)
- Microsoft Excel 2016 (64-bit edition)
- Microsoft Office 2019 for 32-bit editions
- Microsoft Office 2019 for 64-bit editions
- Microsoft Office LTSC 2021 for 32-bit editions
- Microsoft Office LTSC 2021 for 64-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft Office LTSC 2024 for 64-bit editions
- Microsoft Office LTSC for Mac 2021
- Microsoft Office LTSC for Mac 2024
- Office Online Server
✅ Remediation
KB5002871 (Security Update) — fixed build 16.0.10417.20128 KBClick to Run (Security Update) — fixed build https://aka.ms/OfficeSecurityReleases KBRelease Notes (Security Update) — fixed build 16.109.26051019 KB5002865 (Security Update) — fixed build 16.0.5552.1000
🔗 References (7)
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40359
- patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108650
- referencehttps://support.microsoft.com/help/5002871
- referencehttps://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
- patchhttps://go.microsoft.com/fwlink/p/?linkid=831049
- patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108648
- referencehttps://support.microsoft.com/help/5002865