StringListPathField.to_internal_value() calls os.path.exists() on unbounded user-supplied paths. 200 vs 400 response reveals existence of arbitrary absolute paths on the controller-web pod. Tenant superuser can confirm /etc/tower/SECRET_KEY, k8s service-account token, receptor sockets, ConfigMap mount points. Mainly impactful on managed AAP (ansiblecloud.com) where tenant admin != host admin.