The security of your accounts is of the utmost importance to us here at SoundCloud. Due to a recently discovered vulnerability with the service that provides secure browsing for a majority of the Internet (not just SoundCloud), we will be signing out everyone from their SoundCloud accounts. You may have read about this issue – it’s called “Heartbleed.”
When you sign back in, the fixes we’ve already put in place will take effect. You should also change your password. If you don’t want to wait for us to force sign you out, signing out and then signing back in yourself will fix the issue. Sign out on both web and the SoundCloud app. We are not aware of any exploitation of this vulnerability on SoundCloud.
If you experience any issues signing back in, check out this help center article. If you normally sign in using Facebook or Google+ and need help signing back in, please read this help center article.
For a more technical explanation of this issue, please read “Security Update: Heartbleed vulnerability in OpenSSL” on SoundCloud’s Developer Blog.