It’s unclear to me, but seems that LastPass users may have had their password store stolen, in a mostly encrypted form.

It might be possible for the criminals to break the “vaults” if they know the algorithm.

A LastPass user, who hasn’t already done so, might like to check the vulnerability of their master password.

One way would be using https://haveibeenpwned.com/Passwords

(Usual caveats and warnings apply, you decide whether you think this online check is safe!)