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access restrictions, which allows remote authenticated users, with "access content" privileges, to read the title of an unpublished node via a q=ctools/autocomplete/node/ value accompanied by the first character of the node's title.
References to Advisories, Solutions, and Tools
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Advisory; Patch Information
20100520 Drupal Chaos Tools Suite (Ctools) Module Multiple Vulns