Jiyu Kukan Toku-Toku coupon App for iOS versions 3.5.0 and earlier, and Jiyu Kukan Toku-Toku coupon App for Android versions 3.5.0 and earlier are vulnerable to improper server certificate verification. If this vulnerability is exploited, a man-in-the-middle attack may allow an attacker to eavesdrop on an encrypted communication.
https://www.runsystem.co.jp/g1-pr/17570
https://play.google.com/store/apps/details?id=jp.runsystem