Apache Tomcat Permissions Privileges and Access Controls Vulnerability - CVE-2012-3546
org/apache/catalina/realm/RealmBase.java in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.30 when FORM authentication is used allows remote attackers to bypass security-constraint checks by leveraging a previous setUserPrincipal call and then placing /j_security_check at the end of a URI.