FOSSBilling 0.5.4-0.7.x - Unauthenticated System API Role Authorization Bypass

FOSSBilling versions 0.5.4 through 0.7.x contain an authorization bypass in API role handling. The internal system role is accepted from the URL, resolves to the cron-admin identity, and reaches privileged system API methods without authentication, a session, or a CSRF token. Version 0.8.0 reject...