The forum list in Drupal 7.x before 7.14 does not properly check user permissions for unpublished forum posts, which allows remote authenticated users to obtain sensitive information such as the post title via the forum overview page.
http://www.securityfocus.com/bid/53359
http://www.mandriva.com/security/advisories?name=MDVSA-2013:074
http://secunia.com/advisories/49012
http://drupal.org/node/1557938