Drupal 6.x before 6.16 and 5.x before version 5.22 does not properly block users under certain circumstances. A user with an open session that was blocked could maintain their session on the Drupal site despite being blocked.Referenceshttps://security-tracker.debian.org/tracker/CVE-2010-2473https://www.drupal.org/node/731710https://www.openwall.com/lists/oss-security/2010/06/28/8
