If there are communicants, then the deacon at High Mass (or at Low Mass the server) says the Confiteor:
ONFITEOR Deo omnipotenti, beatae Mariae semper Virgini, beato Michaeli Archangelo, beato Joanni Baptistae, sanctis Apostolis Petro et Paulo, omnibus Sanctis, et tibi, pater, quia peccavi nimis cogitatione verbo, et opere: (Percutit sibi pectus ter, dicens) mea culpa, mea culpa, mea maxima culpa. Ideo precor beatam Mariam semper Virginem, beatum Michaelem Archangelum, beatum Joannem Baptistam, sanctos Apostolos Petrum et Paulum, omnes Sanctos, et te, pater, orare pro me ad Dominum Deum nostrum.
CONFESS to Almighty God, to Blessed Mary ever Virgin, to Blessed Michael the Archangel, to Blessed John the Baptist, to the Holy Apostles Peter and Paul, to all the angels and Saints, and to you, Father, that I have sinned exceedingly in thought, word and deed: (He strikes is breast three times) through my fault, through my fault, through my most grievous fault. Therefore I beseech the Blessed Mary ever Virgin, Blessed Michael the Archangel, Blessed John the Baptist, the Holy Apostles Peter and Paul, all the Saints, and you, Father, to pray for me to the Lord our God.
The Priest pronounces the words of absolution:
Misereatur vestri omnipotens Deus, et dimissis peccatis vestris, perducat vos ad vitam aeternam.
Almighty God have mercy on you, and forgiving you your sins, bring you to life everlasting.
All present make the sign of the cross while the Priest says:
Indulgentiam, absolutionem, et remissionem peccatorum vestorum, tribuat vobis omnipotens et misericors Dominus.
May the almighty and merciful Lord grant you pardon, absolution, and remission of your sins.