Several vulnerabilities have been discovered in Drupal 6 a fully-featured content management framework. The Common Vulnerabilities and Exposures project identifies the following problems:
Several issues have been discovered in the OpenID module that allows malicious access to user accounts.
The upload module includes a potential bypass of access restrictions due to not checking letter case-sensitivity.
The comment module has a privilege escalation issue that allows certain users to bypass limitations.
Several cross-site scripting (XSS) issues have been discovered in the Action feature.
For the stable distribution (lenny), these problems have been fixed in version 6.6-3lenny6.
For the testing distribution (squeeze) and the unstable distribution (sid), these problems have been fixed in version 6.18-1.
We recommend that you upgrade your drupal6 packages.