This security issue only effects you if
- you use Android 6,
- you have not disabled cloud backups,
- and you stored your password in the Tutanota app.
Since Google has decided to backup all app data by default beginning with Android 6, your password might have been stored on their servers and compromised. The new Tutanota app version prevents this behavior. After updating the app, please change your password immediately.
We are very sorry about this bug. At Tutanota we focus on security and transparency. That's why we fixed this bug immediately and informed you about it. Thank you for sharing our passion for privacy!