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OpenAdvisories
High MSRC-CVE-2026-81396 1 CVE

Microsoft Excel Remote Code Execution Vulnerability

Published Sep 8, 2026 · Updated Oct 16, 2026 · Revision 3

Vendor: Microsoft

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
An attacker must send a user a malicious Office file and convince them to open it.

Are the updates for Microsoft Office LTSC for Mac 2021 and 2024 currently available?
Yes. As of September 16, 2026, the security update for Microsoft Office LTSC for Mac 2021, 2024 and Microsoft Office 365 for Mac are available. Customers running Microsoft Office LTSC for Mac 2021, 2024 and Microsoft Office 365 for Mac should ensure the update is installed to be protected from this vulnerability.

Security updates
16.112.26083020 — https://learn.microsoft.com/en-us/officeupdates/release-notes-office-for-mac
16.0.10417.20207 — https://support.microsoft.com/help/5002910
16.0.10417.20207 — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
16.0.20326.20138 — https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates
16.0.5569.1003 — https://support.microsoft.com/help/5002914
16.0.5569.1003 — https://support.microsoft.com/help/5002904

Vulnerabilities 1

Revision history

  1. #3

    Updated an acknowledgement. This is an informational change only.

  2. #2

    Microsoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any action. See the [Release Notes](https://go.microsoft.com/fwlink/p/?linkid=831049) for more information and download links.

  3. #1

    Information published.

References