I think you may be better off saying what you are trying to accomplish and what you have tried so you can get help.
This is a very general question with an answer that depends on what you need to do? If you want to access and display wix users and password data from the CRM or Users API then the answer is no.
Most developers will tell you this is a bad idea in the first place as you should never have passwords and user names together in one place AND passwords should be put through a one way hash for security purposes.
So basically, think about what you are trying to do, say why you need to do it and what you have tried. Then the community will do its best to help.
Hope that helps