Checkmarx issue XS_Reflected_XSS

Question

I am facing a XS_Reflected_XSS issue related to Checkmarx. Working in SAP HANA XSJS.

Following is my code extract :

action = **$.request.parameters.get("action");**
        switch ($.request.method) {
        case $.net.http.GET:
            switch (action) {
            case "ds":
                res = aLib.getds();
                break;

It calls the $.request.parameters.get("action"); as a checkmarx issue. Anyone knows how to resolve this.

Thanks.