Description
An unauthenticated client can query the Security Domain hosts inventory via GET /ca/rest/securityDomain/hosts and receive a structured response enumerating internal PKI/CA hosts and roles (security domain topology / participating subsystems / hostnames). This is information disclosure at an authentication boundary: inventory/relationship metadata is exposed without requiring a principal, client cert, or session. 
An unauthenticated adversary with access to the network could enumerate PKI host/subsystem topology, target high-value Dogtag endpoints, or craft follow-on attacks (SSRF/pivots/phishing) using real internal names. 
Recommendations
There is no reason to share the foreman version in the response and should be masked.