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According to public reports , more than half a billion accounts were impacted during a security breach in Like many others, Simon received a notification that his account was included in the breach. Like many others, Simon logged in to his account and changed his password. He then opened his iPhone Mail application since he had configured the app to use his Yahoo account.

He expected to be prompted for his new password and was more than a little surprised when he found it was not necessary. Even though he had changed the password associated with his Yahoo account, the phone was still connected. Upon investigating, it became clear that Yahoo had issued a permanent credential to the device. This credential does not expire and is not revoked when the password changes.

In other words, if someone already obtained access to your account and configured the iOS Mail app to use it, they would still have access to the account even after the password changes. This presents a couple of different problems.

First, steps beyond changing your password are not being clearly communicated from Yahoo. Here you are able to see which applications are connected to your account with an option to remove them. Looking at the phone settings Figure 3 is of little help. Looking at the setting shows there is no option via the app to change the password.

This is likely by design. When you set up your mail account on the device, it gets permanently credentialed until the credential is revoked through the server. In fact, your list should look something like this:.

The steps users take after a breach notification often determine whether further account damage occurs. Think changing your Yahoo password is enough? How hacktivists use defacement The connected workforce: The importance of protecting home and corporate networks. This should still be your first step. It should always be your first reaction after an account compromise. Have trouble remembering different passwords? This will make it more difficult for attackers to access your information even if your password is compromised.

You still need to go through the website to remove a device. Review your devices and activity. Understanding which devices access your account is key to finding unusual or unauthorized activity.