• Advisory ID: DRUPAL-SA-CONTRIB-2009-040
  • Project: Advanced Forum (third-party module)
  • Version: 5.x, 6.x
  • Date: 2009-July-1
  • Security risk: Moderately critical
  • Exploitable from: Remote
  • Vulnerability: Multiple vulnerabilities


Cross-site scripting

The Advanced Forum module does not correctly handle certain arguments obtained from the URL. By enticing a suitably privileged user to visit a specially crafted URL, a malicious user is able to insert arbitrary HTML and script code into forum pages. Such a cross-site scripting attack may lead to the malicious user gaining administrative access. Wikipedia has more information about cross-site scripting (XSS).

This issue affects both Advanced Forum for Drupal 5.x and Advanced Forum for Drupal 6.x.

Input format access bypass

User signatures have no separate input format, they use the format of the comment with which they are displayed. A user will no longer be able to edit a comment when an administrator changes the comment's input format to a format that is not accessible to the user. However they will still be able to modify their signature, which will then be processed by the new input format.

If the new format is very permissive, via their signature, the user may be able to insert arbitrary HTML and script code into pages or, when the PHP filter is enabled for the new format, execute PHP code.

This issue affects Advanced Forum for Drupal 6.x only.

Versions affected

  • Advanced Forum for Drupal 5.x prior to Advanced Forum 5.x-1.2
  • Advanced Forum for Drupal 6.x prior to Advanced Forum 6.x-1.2


Upgrade to the latest version:

See also the Advanced Forum project page.

Fixed by

Michelle Cox, the project maintainer.


The security contact for Drupal can be reached at security at drupal.org or via the form at http://drupal.org/contact.