• Advisory ID: DRUPAL-SA-CONTRIB-2010-072
  • Project: Hierarchical Select (third-party module)
  • Version: 5.x, 6.x
  • Date: 2010-July-07
  • Security risk: Moderately critical
  • Exploitable from: Remote
  • Vulnerability: Cross Site Scripting


The Hierarchical Select module provides a "hierarchical_select" form element, which is a greatly enhanced way for letting the user select items in a taxonomy. The module does not sanitize some of the user-supplied data before displaying it, leading to a Cross Site Scripting (XSS) vulnerability that may lead to a malicious user gaining full administrative access.

This vulnerability is mitigated by the fact that the attacker must have a role with the 'administer taxonomy' permission.

Versions affected

  • Hierarchical Select module for Drupal 5.x versions prior to 5.x-3.2
  • Hierarchical Select module for Drupal 6.x versions prior to 6.x-3.2

Drupal core is not affected. If you do not use the contributed Hierarchical Select module, there is nothing you need to do.


Install the latest version:

See also the Hierarchical Select project page.

Reported by

Fixed by


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