What is Spring Security?

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Spring Security is a powerful and customizable framework in the Spring ecosystem designed to provide authentication, authorization, and protection against common security vulnerabilities in Java applications. It acts as a security layer for Spring-based apps, ensuring only authorized users can access specific resources.

At its core, Spring Security handles two main tasks:

Authentication – verifying the identity of a user (e.g., via username/password, OAuth2, JWT, LDAP, or SSO).
Authorization – determining whether the authenticated user has the required role or permission to access a resource.

It integrates seamlessly with Spring Boot and supports both declarative security (via annotations like @EnableWebSecurity, @PreAuthorize) and programmatic security (custom filters, handlers).

Additionally, it protects against common web vulnerabilities such as CSRF (Cross-Site Request Forgery), Session Fixation, Clickjacking, and XSS (Cross-Site Scripting) by default. It also enables secure communication through HTTPS and method-level security for fine-grained access control.

Spring Security is widely used in REST APIs, enterprise systems, and microservices because it supports modern protocols like OAuth2.0, OpenID Connect, and JWT-based authentication.

In short, Spring Security provides a flexible, production-ready security framework that ensures applications are robust, secure, and compliant with modern security standards.

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