Spring Security with Spring Boot Actuator: the authorization model that survived the incident 68% of security misconfigs in Spring Boot come from configuration that looks secure because it doesn't throw an error. Yeah, read that again. No exception, no warning in the log, nothing. The endpoint just responds 200 and you don't find out until someone else does. That's exactly what happened in the case I described in the previous post . Actuator running in production, /env and /metrics returning data without asking for credentials — all because Spring Boot 3's default configuration doesn't lock down what you don't know about. We closed the misconfigured endpoints. But closing them wasn't enough — the authorization model that remained was inherited, implicit, and fragile. It had to be rebuilt. My thesis is this: an inherited-by-default authorization model is technically worse than an explicit one, even if both produce the same observable behavior today .…