Did Jan Hus reject the validity of sacraments administered by unworthy priests?

No, Jan Hus did not reject the validity of sacraments administered by unworthy priests.

Although critics accused him of holding radical views regarding the church hierarchy, it is clear that Hus did not conclude that sacraments performed by a hypocritical priest, bishop, or pope were invalid in themselves. He maintained that the priestly office and the sacraments retained their objective validity regardless of the moral state of the individual administering them.1

While Hus was highly critical of the ecclesiastical hierarchy and argued that its authority was strictly spiritual, his teachings remained distinct from those of John Wycliffe on several points, including the nature of the Eucharist. A central focus of his movement was instead the demand for the laity to receive communion "under both kinds" (sub utraque specie), which involved restoring the use of the chalice during the service.12