St. Thomas states that one must avoid the Mass said by sinful priests (sinful without amendment), because sinful priests sin when they celebrate Mass, and so do the people who attend their Mass.
The first category are those who are outside the Church - heretics, schismatics, and the excommunicated.
The second category are those who are inside the Church, and at the same time are certainly known to be sinning, such as keeping a concubine. One can know that he is sinning if he tells on his own accord that he is committing a sin, or if the Church finds out and suspends him. Otherwise, the laity in good conscience can attend their Mass.
From The Summa of St. Thomas Aquinas
Article 9. Whether it is permissible to receive communion from heretical, excommunicate, or sinful priests, and to hear mass said by them?
Objection 1.
It seems that one may lawfully receive Communion from heretical, excommunicate, or sinful priests, and to hear mass said by them. Because, as Augustine says (Contra Petilian. iii), "we should not avoid God's sacraments, whether they be given by a good man or by a wicked one." But priests, even if they be sinful, or heretics, or excommunicate, perform a valid sacrament. Therefore it seems that one ought not to refrain from receiving Communion at their hands, or from hearing their mass.
Objection 2.
Further, Christ's true body is figurative of His mystical body, as was said above (67, 2). But Christ's true body is consecrated by the priests mentioned above. Therefore it seems that whoever belongs to His mystical body can communicate in their sacrifices.
Objection 3.
Further, there are many sins graver than fornication. But it is not forbidden to hear the masses of priests who sin otherwise. Therefore, it ought not to be forbidden to hear the masses of priests guilty of this sin.
On the contrary, The Canon says (Dist. 32): "Let no one hear the mass of a priest whom he knows without doubt to have a concubine." Moreover, Gregory says (Dial. iii) that "the faithless father sent an Arian bishop to his son, for him to receive sacrilegiously the consecrated Communion at his hands. But, when the Arian bishop arrived, God's devoted servant rebuked him, as was right for him to do."
I answer that, As was said above (5,7), heretical, schismatical, excommunicate, [sinful because they are outside the Church] or even sinful priests [sinful albeit inside the Church] , although they have the power to consecrate the Eucharist, yet they do not make a proper use of it; on the contrary, they sin by using it. But whoever communicates with another who is in sin, becomes a sharer in his sin. Hence we read in John's Second Canonical Epistle (11) that "He that saith unto him, God speed you, communicateth with his wicked works."Consequently, it is not lawful to receive Communion from them, or to assist at their mass.
Still there is a difference among the above, because heretics, schismatics, and excommunicates, [certainly sinful because they are outside the Church] have been forbidden, by the Church's sentence, to perform the Eucharistic rite. And therefore whoever hears their mass or receives the sacraments from them, commits sin. But not all who are sinners are debarred by the Church's sentence from using this power [one cannot know with certainty that some of the sinners are indeed sinners]: and so, although suspended by the Divine sentence, yet they are not suspended in regard to others by any ecclesiastical sentence: consequently, until the Church's sentence is pronounced, it is lawful to receive Communion at their hands, and to hear their mass. Hence on 1 Cor. 5:11, "with such a one not so much as to eat," Augustine's gloss runs thus: "In saying this he was unwilling for a man to be judged by his fellow man on arbitrary suspicion, or even by usurped extraordinary judgment, but rather by God's law, according to the Church's ordering, whether he (sinful priest) confess [his sin] of his own accord, or whether he be accused and convicted."
Reply to Objection 1.
By refusing to hear the masses of such priests, or to receive Communion from them,we are not shunning God's sacraments; on the contrary, by so doing we are giving them honor (hence a host consecrated by such priests is to be adored, and if it be reserved, it can be consumed by a lawful priest): but what we shun is the sin of the unworthy ministers.
Reply to Objection 2.
The unity of the mystical body is the fruit of the true body received. But those who receive or minister unworthily, are deprived of the fruit, as was said above (7; 80, 4). And therefore, those who belong to the unity of the Faith are not to receive the sacrament from their dispensing.
Reply to Objection 3.
Although fornication is not graver than other sins, yet men are more prone to it, owing to fleshly concupiscence. Consequently, this sin is specially inhibited to priests by the Church, lest anyone hear the mass of one living in concubinage. However, this is to be understood of one who is notorious, either from being convicted and sentenced, or from having acknowledged his guilt in legal form,or from it being impossible to conceal his guilt by any subterfuge.
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