The Node Reference module in Content Construction Kit (CCK) module 6.x before 6.x-2.7 for Drupal does not perform access checks for the source field in the backend URL for the autocomplete widget, which allows remote attackers to discover titles and IDs of controlled nodes.

The Node Reference module in Content Construction Kit (CCK) module 5.x before 5.x-1.11 and 6.x before 6.x-2.7 for Drupal does not perform access checks before displaying referenced nodes, which allows remote attackers to read controlled nodes.