UBports Ubuntu Touch 16.04 allows the screen-unlock passcode to be used for a privileged shell via Sudo. This passcode is only four digits, far below typical length/complexity for a user account's password. NOTE: a third party states "The described attack cannot be executed as demonstrated.

Online Accounts Signon daemon gives out all oauth tokens to any app

signond before 8.57+15.04.20141127.1-0ubuntu1, as used in Ubuntu Touch, did not properly restrict applications from querying oath tokens due to incorrect checks and the missing installation of the signon-apparmor-extension. An attacker could use this create a malicious click app that collects oauth tokens for other applications, exposing sensitive information.