Cross-site scripting (XSS) vulnerability in Six Apart Movable Type Enterprise (MTE) 1.x before 1.56; Movable Type (MT) 3.x before 3.38; and Movable Type, Movable Type Open Source (MTOS), and Movable Type Enterprise 4.x before 4.23 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors, possibly related to "application management."