spring安全文档中有一些例子说明了如何做到这一点。
我想你可以这样做：

@Configuration
@EnableWebFluxSecurity
static class MultiSecurityHttpConfig {

    @Order(Ordered.HIGHEST_PRECEDENCE)                                                      
    @Bean
    SecurityWebFilterChain yourEndpointHttpSecurity(ServerHttpSecurity http) {
        http
            .securityMatcher(new PathPatternParserServerWebExchangeMatcher("/your-endpoint/**"))      
            .authorizeExchange((exchanges) -> exchanges
                .anyExchange().authenticated()
            )
            .httpBasic(withDefaults());                         
        return http.build();
    }

    @Bean
    SecurityWebFilterChain webHttpSecurity(ServerHttpSecurity http) {                       
        http
            .csrf().disable()
            .exceptionHandling().and()
            .httpBasic().disable()                                                  
        return http.build();
    }

}

这样首先你的 yourEndpointHttpSecurity 如果路径匹配，将对bean进行求值 /your-endpoint/** 然后是你的默认值 webHttpSecurity