A Forum Status Update from Turbine
alerts users to a possible security issue with The Lord of the Rings Online
they've been checking into (thanks El Pit). They say they will directly contact those they feel have been directly compromised, but also suggest that all of their users change their passwords:
Even though this issue appears to be limited in scope, if we believe that your account has been impacted we will contact you directly. As an additional precaution we recommend that all players change their passwords by visiting https://myaccount.turbine.com. Please remember to use unique, hard-to guess passwords that are not associated with other online services or sites, and always look for and report unusual activity in your account to Turbine customer support.