We have discovered and addressed a security breach. | Matrix.org
▻https://matrix.org/blog/2019/04/11/security-incident
An attacker gained access to the servers hosting Matrix.org. The intruder had access to the production databases, potentially giving them access to unencrypted message data, password hashes and access tokens. As a precaution, if you’re a matrix.org user you should change your password now.