What do you mean by “the Church”?
If you mean the pope and bishops (persons), then you equivocate with the word “authority,” because the authority of a person is not the same kind of authority as that of a document, even an inspired one.
If you mean magisterial teaching (not persons, but what certain persons teach), it has a lower status than scripture because, while infallible, it is not inspired; although it is necessary for certitude about scripture.
Magisterial teaching is not to be confused with sacred tradition, which, like scripture, is the word of God (see CCC 74 ff).