Recently identified a publicly accessible Spring Boot Actuator /env endpoint during a security assessment. What initially appeared to be a routine configuration exposure turned out to reveal: • Internal service architecture • Backend microservice endpoints • Internal hostnames and network information • Deployment and filesystem details • Security configuration settings • Credentials and encryption-related secrets This serves as a reminder that management interfaces can expose far more than operational metadata when left accessible in production environments. Key lessons: ✓ Restrict Actuator endpoints to trusted administrative networks ✓ Avoid exposing /env in production ✓ Review environment variables and configuration repositories for secrets ✓ Rotate any exposed credentials immediately ✓ Use least-privilege exposure lists rather than wildcard endpoint exposure Small configuration mistakes can create a complete roadmap of an organization's internal infrastructure. #CyberSecurity #AppSec #SpringBoot #DevSecOps #BugBounty #SecurityResearch #OWASP #InfoSec