Apache Tomcat default installation contains the "/examples" directory which has many example servlets and JSPs. Some of these examples are a security risk and should not be deployed on a production server.
The Sessions Example servlet (installed at /examples/servlets/servlet/SessionExample) allows session manipulation. Because the session is global this servlet poses a big security risk as an attacker can potentitally become an administrator by manipulating its session.
Bypassing HttpOnly Cookies protection, CSRF cookies manipulation, Session manipulation.
Disable public access to the examples directory.
Tomcat Servlet Examples threats