Unauthorized access to account information was discovered on Drupal.org and groups.drupal.org.

From drupal.org/news/130529SecurityUpdate

What happened?

Malicious files were placed on association.drupal.org servers via a third-party application used by that site. Upon discovering the files during a security audit, we shut down the association.drupal.org website to mitigate any possible ongoing security issues related to the files. The Drupal Security Team then began forensic evaluations and discovered that user account information had been accessed via this vulnerability.