Jenkins before versions 2.44, 2.32.2 is vulnerable to an information exposure in the internal API that allows access to item names that should not be visible (SECURITY-380). This only affects anonymous users (other users legitimately have access) that were able to get a list of items via an UnprotectedRootAction.
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2606
https://github.com/jenkinsci/jenkins/commit/09cfbc9cd5c9df7c763bc976b7f5c51266b63719