Microsoft SharePoint Server Remote Code Execution Vulnerability

According to the CVSS metric, successful exploitation of this vulnerability could lead to total loss of confidentiality (C:H), integrity (I:H), and availability (A:H). What does that mean for this vulnerability?
An attacker who successfully exploits this vulnerability could perform a remote attack that could enable access to the victim's information and the ability to alter information. Successful exploitation could also potentially cause downtime for the targeted environment.

According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?
The attacker must be authenticated to the target site as at least a Site Member.

How could an attacker exploit this vulnerability?
An attacker could exploit the vulnerability by leveraging vulnerable APIs through a deserialization of unsafe data input vulnerability. Exploitation of this vulnerability requires that a user access a susceptible API on an affected version of SharePoint with specially-formatted input, resulting in possible remote code execution on the SharePoint Server.

Security updates
16.0.5404.1000 — https://support.microsoft.com/help/5002425
16.0.10400.20008 — https://support.microsoft.com/help/5002423
16.0.16130.20642 — https://support.microsoft.com/help/5002424