Unknown vulnerability in Drupal 4.5.0 through 4.5.3, 4.6.0, and 4.6.1 allows remote attackers to execute arbitrary PHP code via a public comment or posting.
http://www.securityfocus.com/bid/14110
http://www.drupal.org/security/drupal-sa-2005-002/advisory.txt
http://www.debian.org/security/2005/dsa-745