matrix.org was compromised via hack March 13, 2019...

The normally fairly reliable Matrix that provides secure, encrypted chat and communication applications has been hacked. Be sure to check their status before downloading any packages from the site.

From the Matrix page linked below is this quote:

Here's what you need to know.

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.

The matrix.org homeserver has been rebuilt and is running securely; bridges and other ancillary services (e.g. this blog) will follow as soon as possible. Modular.im homeservers have not been affected by this outage.

The security breach is not a Matrix issue.

Uh-huh.

Anyway -- for more info, see:

https://matrix.org/blog/2019/04/11/we-have-discovered-and-addressed-a-security-breach-updated-2019-04-12/

and

https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2

The current status (at any time, not just for this event) of Matrix is here:
https://status.matrix.org/