Spring Boot 3 - How to solve 403 Forbidden status for POST request?

It is not recommended, by it you added just Spring Boot Security dependency, you can disable SCRF protection and let to request to all endpoints - in the future take care of security.

Example SpringSecurityConfig.java file.

package com.example.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.web.SecurityFilterChain;

@Configuration
public class SpringSecurityConfig {

    @Bean
	public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
            .csrf().disable()
		    .authorizeHttpRequests()
                .anyRequest().permitAll();
		return http.build();
	}
}