Apache Tomcat Permissions Privileges and Access Controls Vulnerability - CVE-2009-2901
The autodeployment process in Apache Tomcat 5.5.0 through 5.5.28 and 6.0.0 through 6.0.20 when autoDeploy is enabled deploys appBase files that remain from a failed undeploy which might allow remote attackers to bypass intended authentication requirements via HTTP requests.