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.

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.

The comment module in Drupal 5.x before 5.23 and 6.x before 6.18 allows remote authenticated users with certain privileges to bypass intended access restrictions and reinstate removed comments via a crafted URL, related to an "unpublishing bypass" issue.

The upload module in Drupal 5.x before 5.23 and 6.x before 6.18 does not properly support case-insensitive filename handling in a database configuration, which allows remote authenticated users to bypass the intended restrictions on downloading a file by uploading a different file with a similar name.

Cross-site scripting (XSS) vulnerability in the Contact module (modules/contact/contact.admin.inc or modules/contact/contact.module) in Drupal Core 5.x before 5.21 and 6.x before 6.15 allows remote authenticated users with "administer site-wide contact form" permissions to inject arbitrary web script or HTML via the contact category name.

Cross-site scripting (XSS) vulnerability in the Forum module in Drupal 6.x before 6.13 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Unspecified vulnerability in Drupal 5.x before 5.17 and 6.x before 6.11, as used in vbDrupal before 5.17.0, allows user-assisted remote attackers to obtain sensitive information by tricking victims into visiting the front page of the site with a crafted URL and causing form data to be sent to an attacker-controlled site, possibly related to multiple / (slash) characters that are not properly handled by includes/bootstrap.inc, as demonstrated using the search box. NOTE: this vulnerability can be leveraged to conduct cross-site request forgery (CSRF) attacks.

Cross-site scripting (XSS) vulnerability in Drupal 5.x before 5.17 and 6.x before 6.11, as used in vbDrupal before 5.17.0, allows remote attackers to inject arbitrary web script or HTML via crafted UTF-8 byte sequences before the Content-Type meta tag, which are treated as UTF-7 by Internet Explorer 6 and 7.

The node module API in Drupal 5.x before 5.11 allows remote attackers to bypass node validation and have unspecified other impact via unknown vectors related to contributed modules.

The core upload module in Drupal 5.x before 5.11 allows remote authenticated users to bypass intended access restrictions and read "files attached to content" via unknown vectors.