The optional request routing feature forwards requests to their configured destination without applying the security constraints of that destination or the protection of the web application's private directories. If a route copies client-controlled parts of the request path into its destination, a remote attacker can reach protected resources or read application configuration and class files. Only installations with such a routing configuration are affected. Users are recommended to upgrade to version 10.3.0 or 11.0.0-M2, which fix the issue.