Are Guids Cryptographically Secure?

The random GUIDs you create with the Guid. NewGuid method are not known to be cryptographically secure. Thus, it's theoretically possible for a user to predict a GUID value that you generate for another user or task and use this to exploit weaknesses in your system.

Are GUIDs safe passwords?

GUIDs are globally unique identifiers, and given their rather incomprehensible presentation, some people may be tempted to use them (or parts of them) as passwords. ... GUIDs are designed for uniqueness, not for security.

Are GUIDs sensitive information?

Yes, but generating a list of values means nothing if they can't be tested.