OAuth2 and JWT Security Patterns for Cloud-Native Microservices

Abstract

Cloud-native microservices architectures have become a popular approach to building scalable, resilient, and flexible applications, however the distributed nature of microservices introduces major security challenges around authentication, authorization, identity propagation, and secure inter-service communication. To solve these issues, OAuth 2.0 and JSON Web Tokens (JWTs) have become popular as they provide standardized ways to do authorization and stateless authentication. The study analyses the security patterns of OAuth2 and JWT to secure cloud-native microservices settings and evaluates their effectiveness to address typical risks such as token theft, replay attacks, privilege escalation and unauthorized access. Existing security practices are carefully analysed and a security architecture is designed based on combining an OAuth2 Authorization Server, Identity Provider, API Gateway and JWT-based access control methods. The proposed framework shows secure token issuance, validation, propagation and revocation across distributed services. The architecture is evaluated in terms of security, scalability, and performance using a case study based on a Kubernetes-based e-commerce microservices platform. Experimental results show that the proposed framework improves the authentication efficiency and the security robustness, and provides acceptable latency for distributed applications. This study contributes to highlighting the importance of short-lived tokens, mutual TLS, token introspection, role-based access control, and central identity management, and to outlining the future directions of Zero Trust Architecture, decentralized identity, confidential computing and AI-driven threat detection.