Microsoft Exchange Server Remote Code Execution Vulnerability

According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?
An authenticated attacker could exploit this vulnerability with LAN access.

How could an attacker exploit this vulnerability?
An authenticated attacker who is on the same intranet as the Exchange server can achieve remote code execution via a PowerShell remoting session.

According to the CVSS metric, privileges required is low (PR:L). Does the attacker need to be in an authenticated role on the Exchange Server?
Yes, the attacker must be authenticated with LAN-access and have credentials for a valid Exchange user.

What can cause this vulnerability?
The vulnerability occurs due to improper validation of cmdlet arguments.
Yes, the attacker must be authenticated.

Security updates
15.02.1258.027 — https://support.microsoft.com/help/5030877