Markus Petrux discovered a cross-site scripting vulnerability in the
taxonomy module of drupal6, a fully-featured content management
framework. It is also possible that certain browsers using the UTF-7
encoding are vulnerable to a different cross-site scripting
vulnerability.
Read the full story: DSA-1808 drupal6 – insufficient input sanitising: http://www.debian.org/security/2009/dsa-1808