Why does Spring Boot return a 403 Forbidden error for a POST request to a secured endpoint even with a valid JWT?

What could be the possible reasons that Spring Boot returns a 403 Forbidden error when making a POST request to a secured endpoint, even though a valid JWT is included in the request? How can this issue be resolved?

There are several potential reasons why Spring Boot might return a 403 Forbidden error for a POST request to a secured endpoint, even when a valid JWT is included in the request. Here are some common causes and solutions:

Common Causes: CSRF Protection: Spring Security enables CSRF protection by default. If the CSRF token is missing or incorrect, it can result in a 403 error1.

Incorrect Endpoint Configuration: Ensure that the endpoint is correctly configured to accept POST requests and that the security settings allow authenticated users to access it.

Role/Permission Issues: Verify that the user associated with the JWT has the necessary roles or permissions to access the secured endpoint.

Session Management: If session management is enabled, ensure that the session is properly maintained and that the user is authenticated for the duration of the request.

Incorrect Security Configuration: Review your security configuration to ensure that it is correctly set up to handle JWT authentication2.