Microsoft Office Remote Code Execution Vulnerability

How could an attacker exploit this vulnerability?
Exploitation of this vulnerability requires that an attacker send a malicious link to the victim via email, or that they convince the user to click the link, typically by way of an enticement in an email or Instant Messenger message. In the worst-case email attack scenario, an attacker could send a specially crafted email to the user without a requirement that the victim open, read, or click on the link. This could result in the attacker executing remote code on the victim's machine. When multiple attack vectors can be used, we assign a score based on the scenario with the higher risk (UI:N).

Are the updates for Microsoft Office LTSC for Mac 2021 and 2024 currently available?
Yes. As of December 16, 2025, the security update for Microsoft Office LTSC for Mac 2021 and 2024 are available. Customers running Microsoft Office LTSC for Mac 2021 and 2024 should ensure the update is installed to be protected from this vulnerability.

Is the Preview Pane an attack vector for this vulnerability?
Yes, the Preview Pane is an attack vector.

Are the updates for the Microsoft Office LTSC for Mac currently available?
The security update for Microsoft Office LTSC for Mac 2021 and 2024 are not immediately available. The updates will be released as soon as possible, and when they are available, customers will be notified via a revision to this CVE information.

Security updates
https — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
16.0.5530.1001 — https://support.microsoft.com/help/5002819
16.0.19530.20000 — https://support.google.com/googleplay/answer/113412?hl=en
16.104.25121423 — https://go.microsoft.com/fwlink/p/?linkid=831049