The notifier middleware in OpenStack PyCADF 0.5.0 and earlier, Telemetry (Ceilometer) 2013.2 before 2013.2.4 and 2014.x before 2014.1.2, Neutron 2014.x before 2014.1.2 and Juno before Juno-2, and Oslo allows remote authenticated users to obtain X_AUTH_TOKEN values by reading the message queue (v2/meters/http.request).