Drupal Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2007-5596
The core Upload module in Drupal 4.7.x before 4.7.8 and 5.x before 5.3 places the .html extension on a whitelist which allows remote attackers to conduct cross-site scripting (XSS) attacks by uploading .html files.