Unspecified vulnerability in LoginToboggan 6.x-1.x before 6.x-1.5, a module for Drupal, when "Allow users to login using their e-mail address" is enabled, allows remote blocked users to bypass intended access restrictions via unspecified vectors.
http://www.vupen.com/english/advisories/2009/1312
http://www.securityfocus.com/bid/34945