The auto-complete functionality in the Chaos Tool Suite (aka CTools) module 6.x before 6.x-1.4 for Drupal does not follow access restrictions, which allows remote authenticated users, with "access content" privileges, to read the title of an unpublished node via a q=ctools/autocomplete/node/ value accompanied by the first character of the node's title.
AV:N/AC:M/Au:S/C:P/I:N/A:N
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