Many ESO players logging on to the forums were greeted with a message that said an admin has changed their password. Zenimax Online Studio has posted an explanation on the official forums.
The vendor used to power the ESO forums reset all user passwords for partners that had upgraded to their most recent software version. Players are required to reset their password as a security precaution to address a potential security issue.
“Our vendor has confirmed that there was no personal data shared as part of the previously mentioned security issue. For instructions on how to access your forum account due to the password being reset, please visit this Support article. “Update by Gina Bruno 2019-11-20