importbuddy.php in the BackupBuddy plugin 1.3.4, 2.1.4, 2.2.25, 2.2.28, and 2.2.4 for WordPress allows remote attackers to bypass authentication via a crafted integer in the step parameter.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-2682
http://packetstormsecurity.com/files/120923
http://archives.neohapsis.com/archives/fulldisclosure/2013-03/0205.html