Tomcat Security Updates.
If you're using Tomcat 4.0.4 or Tomcat 4.1.10 - you might want to upgrade to 4.0.5 or 4.1.12.
A security vulnerability has been confirmed to exist in all Apache Tomcat 4.x versions (including Tomcat 4.0.4 and Tomcat 4.1.10), which allows to use a specially crafted URL to return the unprocessed source of a JSP page, or under special circumstances a static resource which would otherwise have been protected by security constraint, without the need of being properly authenticated.