"Piccoma" App for Android and iOS versions prior to 6.20.0 uses a hard-coded API key for an external service, which may allow a local attacker to obtain the API key. Note that the users of the app are not directly affected by this vulnerability.
https://play.google.com/store/apps/details?id=jp.kakao.piccoma
https://jvn.jp/en/jp/JVN01073312/
https://apps.apple.com/jp/app/%E3%83%94%E3%83%83%E3%82%B3%E3%83%9E/id1091496983