  this._cbfinal = function(allowed, methodsLeft, isPartial) {
    if (!self._finalResponse) {
      self._finalResponse = true;
      cb(self, allowed, methodsLeft, isPartial);
    }
  };
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.