Sunrise Atelier, Inc. is alerting its Sunrise Calendar users that its database provider has experienced a security breach. As a result, users are being asked to change their iCloud passwords just to be safe.

According to a posting on the Sunrise blog, and email to users, MongoHQ servers were breached. As a preventive measure, Sunrise users are advised as follows:

If you connected an iCloud calendar to Sunrise, even though we don’t store any credentials, the security breach may have put some of your calendar data at risk. As a precautionary measure, we recommend that you change your iCloud password and reconnect it to Sunrise: simply click here and then click on “Reset your password” to do it.

As one of the many precautional measures we are taking, we will be logging every Sunrise user out of the app. Simply log back in using the “I’m Already a Sunrise User” button and choosing one of the options that you had previously connected to your account.

Just to be clear, none of the data affected by this incident has any access to your credit card or banking information.

Sunrise notes that a users’ Google, Facebook, and Twitter data is safe, as is information from LinkedIn, Foursquare, and Producteev. Finally, Sunrise says that a users’ email and password are safe if the “Email” option was chosen at signup.

If you have further questions about this breach, you are asked to send an email to support@sunrise.am.

First launched in February of this year, Sunrise Calendar was recently updated for iOS 7. This update was not related to today’s development.

We thank AppAdvice reader William for bringing this news to our attention.