Turbine has posted a new article on the Lord of the Rings Online community site detailing the possible forum security breach and what the team has done to end the issue.
According to the post, the LOTRO forums were taken offline to investigate the issue and to resolve the issue. Devs have indicated that they will continue their vigilance on the forums and any more possible attempts to obtain user information.
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.
Read the full disclosure post on the Lord of the Rings Online site.