Cross-site request forgery (CSRF) vulnerability in EC-CUBE plugin 'Mail Magazine Management Plugin' ver4.0.0 to 4.1.1 (for EC-CUBE 4 series) and ver1.0.0 to 1.0.4 (for EC-CUBE 3 series) allows a remote unauthenticated attacker to hijack the authentication of an administrator via a specially crafted page, and Mail Magazine Templates and/or transmitted history information may be deleted unintendedly.