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It turns out that Microsoft keeps your original Skype account password separate so that it can still be used to access the service with a Skype username. Microsoft offers the ability to link a Skype and Microsoft Account together to make sign-in and security easier. This wave of attack appears to be growing in size, and Skype users who opted for Microsoft’s two-factor security are also vulnerable. Skype has fallen victim to similar attacks before, and hackers were able to spoof messages on the system in 2015 after using lists of stolen usernames and passwords to gain access to accounts. The owners then have to regain access and that is when most find out about it. Breached Skype accounts are used to send thousands of spam messages before they’re locked by Microsoft. Skype displays all linked accounts here and once again fails to verify at any stage if you are really the account owner of the original account.Skype accounts are being hacked since at least August last year. You can use that token to reset the password of the current account or the original account. Skype interestingly enough sends the password token to the associated email address and displays its in the Skype interface as well. When you use Skype's password reset system you are asked to enter the email address associated with the account. While you can't see the contacts, chat history and other information of the original user just yet, the following method gets you full access to that username's account.

Instead, you are automatically logged in to the account. The issue here is that Skype won't ask you to verify the email address that you have just entered during setup. If it already exists in the database, it will give you the option to create a new Skype name using that email address and links both accounts internally. Skype checks the email address that you enter when you create a new account. The only information attackers need to successfully compromise a Skype account is the victim's email address. Skype's password reset system is vulnerable to an attack that gives attackers full control over affected accounts.