Microsoft Outlook Spoofing Vulnerability

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

How could an attacker exploit this vulnerability?
An attacker could exploit this spoofing vulnerability by using a specially crafted email to trigger an outbound NTLM authentication attempt to an attacker‑controlled server, resulting in credential disclosure.

There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software?
Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.

Security updates
16.0.5539.1002 — https://support.microsoft.com/help/5002841
16.0.5539.1002 — https://support.microsoft.com/help/5002840
16.0.10417.20097 — https://support.microsoft.com/help/5002834
16.0.10417.20097 — https://support.microsoft.com/help/5002836
https — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
16.106.26020821 — https://go.microsoft.com/fwlink/p/?linkid=831049
16.0.19127.20518 — https://support.microsoft.com/help/5002833
16.0.5539.1002 — https://support.microsoft.com/help/5002839