*** This bug is a security vulnerability ***

Public security bug reported:

Ubuntu 15.04 r74

1. In Online Accounts, set up a Google account.
2. Install the Calendar app.
3. From the Calendar app's kebab menu, choose "Calendars".

What you see: Your Google account is already listed as a calendar.

What you should see: The Google account is not listed, because you
haven't given permission for the app to know that it exists.

This is a privacy violation: it means that a service can see whether you
have an account with a competing service when that's none of their
business. For example, it means that a Facebook app could tell whether
you have a Twitter account, or vice versa; a Flickr app could tell
whether you have an Instagram account, or vice versa; a Strava app could
tell whether you have a Fitbit account, and so on.

<https://wiki.ubuntu.com/OnlineAccounts#App_access>: "An app should have
no idea whether you have any accounts of a particular type stored in
Online Accounts. It should merely ask for access to an account of a
particular type."

** Affects: ubuntu-system-settings-online-accounts (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1479747

Title:
  An app can see whether you have an account without permission

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