Unspecified vulnerability in Movable Type 4.x before 4.36 and 5.x before 5.05 allows remote attackers to read or modify data via unknown vectors.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-4985
http://www.movabletype.org/2011/05/movable_type_51_and_505_436_security_update.html