Shared account password management is the same as Privileged Account Management (PAM), but it can be problematic.
For simplicity, many IT teams sidestep best practices and create one privileged account per server, or even one username and password to use for multiple privileged accounts. These are shared accounts.
The problem with sharing accounts is that you never know precisely who is using them at any given time. So if you have a server failure, you cannot tell who logged in before the system went down.
Shared Account Password Management Resources:
Blogs
4 Steps to Reduce the Risk of Shared Account Passwords
Free Tools
Browser-Stored Password Discovery Tool