The core BlogAPI module in Drupal 5.x before 5.11 and 6.x before 6.5 does not properly validate unspecified content fields of an internal Drupal form, which allows remote authenticated users to bypass intended access restrictions via modified field values.
https://exchange.xforce.ibmcloud.com/vulnerabilities/45761
http://www.openwall.com/lists/oss-security/2008/10/21/7