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.
https://exchange.xforce.ibmcloud.com/vulnerabilities/59515
http://www.vupen.com/english/advisories/2010/1546
http://secunia.com/advisories/40318
http://secunia.com/advisories/40243
http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043191.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043172.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043100.html