Drupal Improper Authentication Vulnerability - CVE-2010-3685
The OpenID module in Drupal 6.x before 6.18 and the OpenID module 5.x before 5.x-1.4 for Drupal violates the OpenID 2.0 protocol by not checking for reuse of openid.response_nonce values which allows remote attackers to bypass authentication by leveraging an assertion from an OpenID provider.