Ember.js 1.0.x before 1.0.1, 1.1.x before 1.1.3, 1.2.x before 1.2.1, 1.3.x before 1.3.1, and 1.4.x before 1.4.0-beta.2 allows remote attackers to conduct cross-site scripting (XSS) attacks by leveraging an application that contains templates whose context is set to a user-supplied primitive value and also contain the `{{this}}` special Handlebars variable.