113 We wish in this matter to repeat the remarks which Our predecessor Benedict XIV makes with regard to the definitions of the Council of Trent: "First We must state that none of the faithful can hold that private Masses, in which the priest alone receives holy communion, are therefore unlawful and do not fulfill the idea of the true, perfect and complete unbloody sacrifice instituted by Christ our Lord. For the faithful know quite well, or at least can easily be taught, that the Council of Trent, supported by the doctrine which the uninterrupted tradition of the Church has preserved, condemned the new and false opinion of Luther as opposed to this tradition." "If anyone shall say that Masses in which the priest only receives communion, are unlawful, and therefore should be abolished, let him be anathema."
Source: Mediator Dei (Vatican.va)