If you have an account on our forums or wiki, and are using your password somewhere else, change it immediately. You should still be fine, but this is a necessary precaution.
Our forums and wiki got compromised by an unknown third-party. On Friday a user warned us that our wiki was redirecting to some Chinese website. As a precaution, we took down that machine (forums + wiki) while we investigated the issue. Now, we are aware that a malicious unknown third-party injected a PHP shell in our server, most likely through a Mediawiki vulnerability. Upon further inspection, we discovered that the forum database had been leaked. For now, our forums and wiki remain offline, while we assess the situation and decide what to do next.
We apologize for this situation, and moving forward we will harden our security surrounding external systems, such as the forums and wiki.
Solder.io and Technic Platform (that includes the launcher) are not affected. Only the forums are affected.
Your Minecraft account is completely unrelated, so it's safe as well.