The East Japan Railway Company JR East Japan application before 1.2.0 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to obtain sensitive information via a crafted certificate.

JR East Japan train operation information push notification App for Android version 1.2.4 and earlier allows remote attackers to bypass access restriction to obtain or alter the user's registered information via unspecified vectors.