Microsoft Outlook Remote Code Execution Vulnerability

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
Exploitation of the vulnerability requires that a user open a specially crafted file.
In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file., In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability.
An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.

According to the CVSS metric, the attack vector is network (AV:N) and privilege required is none (PR:N). What is the target used in the context of the remote code execution?
An attacker who successfully exploits this vulnerability could perform remote code execution in the context of the victim user. The attacker does not need privileges to attempt to exploit this vulnerability.

Security updates
https — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
16.0.5400.1000 — https://support.microsoft.com/help/5002387
15.0.5563.1000 — https://support.microsoft.com/help/5002382