Drupal 6.x before 6.27 and 7.x before 7.18 displays information for blocked users, which might allow remote attackers to obtain sensitive information by reading the search results.

The OpenID module in Drupal 7.x before 7.16 allows remote OpenID servers to read arbitrary files via a crafted DOCTYPE declaration in an XRDS file.

Drupal 7.x before 7.16 allows remote attackers to obtain sensitive information and possibly re-install Drupal and execute arbitrary PHP code via an external database server, related to "transient conditions."

Algorithmic complexity vulnerability in the _filter_url function in the text filtering system (modules/filter/filter.module) in Drupal 7.x before 7.14 allows remote authenticated users with certain roles to cause a denial of service (CPU consumption) via a long email address.

Drupal 7.x before 7.14 does not properly restrict access to nodes in a list when using a "contributed node access module," which allows remote authenticated users with the "Access the content overview page" permission to read all published nodes by accessing the admin/content page.

The forum list in Drupal 7.x before 7.14 does not properly check user permissions for unpublished forum posts, which allows remote authenticated users to obtain sensitive information such as the post title via the forum overview page.

The image module in Drupal 7.x before 7.14 does not properly check permissions when caching derivative image styles of private images, which allows remote attackers to read private image styles.

The request_path function in includes/bootstrap.inc in Drupal 7.14 and earlier allows remote attackers to obtain sensitive information via the q[] parameter to index.php, which reveals the installation path in an error message.

Open redirect vulnerability in the Form API in Drupal 7.x before 7.13 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via crafted parameters in a destination URL.

Cross-site request forgery (CSRF) vulnerability in Drupal 7.12 and earlier allows remote attackers to hijack the authentication of arbitrary users for requests that end a session via the user/logout URI. NOTE: the vendor disputes the significance of this issue, by considering the "security benefit against platform complexity and performance impact" and concluding that a change to the logout behavior is not planned because "for most sites it is not worth the trade-off.