Microsoft SharePoint Server Elevation of Privilege Vulnerability

According to the CVSS metric, the attack vector is network (AV:N), privilege required is none (PR:N), and user interaction is none (UI:N). What is the target used in the context of the elevation of privilege?
An attacker who has gained access to spoofed JWT authentication tokens can use them to execute a network attack which bypasses authentication and allows them to gain access to the privileges of an authenticated user.
The attacker needs no privileges nor does the user need to perform any action.

What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited this vulnerability could gain administrator privileges.

I am running SharePoint Server 2019 and there are multiple updates available. Do I need to install all the updates listed in the Security Updates table for these versions?
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
16.0.10399.20005 — https://support.microsoft.com/help/5002402
16.0.10399.20005 — https://support.microsoft.com/help/5002403