I thought that the User Cross Project ID is used to prevent this happens, and I heard about that the email address is the unique identifier of an user between projects...
Now I have two different accounts on SETI@home and Rosetta@home which have the same email address, and I can not use one of my accounts to login both projects.
Is this a bug, or a feature provided by BOINC?

Each project is a completely separate entity. Email addresses can be used (and re-used) at more than one project, but the email address is only the unique key within each project. You can use the same email address, and even the same password, at two different projects, but there's no transfer between them. If you change your password at project A, you can still log in with the old password at project B - until you change that password separately and independently.

The CPID is a hash generated from the email address, and is shared between projects. It's only used for sharing statistics: you can't use a CPID to join or log into a new project.

You have to become a member of each project, and if you want the cross-project stats to work you have to use the same password. So what you have done is correct.

You have to become a member of each project, and if you want the cross-project stats to work you have to use the same password. So what you have done is correct.

The same password?

As far as I'm aware yes.

Its the email address. All my projects have different passwords.

Now if you use an account manager they usually use one email/password for all projects but that's just to make life easier for the AM.

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MarkJ

As far as I'm aware yes.

How does one project know a users PW at another project? It has to only require same email/user as that's a major security problem.