XWiki "Search Authorization"

Hello List I will try to describe my problem as simple as possible: I've created a User "abc" and a new Webspace "abc". Only the User "abc" has Edit- and View-Rights on the Webspace "abc". That works fine. Now if the user "abc" tries to seach a document on his webspace using the normal search-dialog nothing is found. If i do the same search as admin, searching is successfull. Why that? Normaly the user "abc" should find the documents in a webspace where he has view- and edit-rights? What am i doing wrong? Thanks and greets! Ralph