Android Spoon application version 7.11.1 to 8.6.0 uses hard-coded credentials, which may allow a local attacker to retrieve the hard-coded API key when the application binary is reverse-engineered. This API key may be used for unexpected access of the associated service.
https://spoon-support.spooncast.net/jp/update
https://play.google.com/store/apps/details?id=co.spoonme&hl=en_US