Recently, there was an issue with premium accounts. You can read the whole story in a link below. For people who are too lazy, I will provide a summary of what happened and what to do.
https://mojang.com/2014/04/heartbleed/
2 days ago, in an event dubbed heartbleed, openSSL ( an encryption program) was made public. This is the program Mojang uses and there were many exploits when it was made public. It is possible that someone has access to your minecraft account and password. It is essential to change your password ASAP. There is no trace so anyones password could be compromised. If you aren’t premium, you can disregard this message.
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