On Friday, Mauvaka scored a try and had another ruled out after a video replay during the 59-3 rout of Bordeaux.
Toulouse claimed a record-extending 23rd French title and a third domestic and Champions Cup double having lifted the continental crown in May.
The announcement of the 27-year-old's extension was accompanied on the club's social networks by a photo of the player and president Didier Lacroix smoking cigars and wearing sunglasses in front of the Brennus shield in Marseille's Velodrome stadium.
Mauvaka played 20 matches, including 14 as a starter, this season, scoring 10 tries.
The 33-time capped player was ahead of another international hooker, Julien Marchand, in the hierarchy for the final stages of the Top 14 and Champions Cup.
Originally from New Caledonia, he spent his entire career at Toulouse, winning the Top 14 in 2019, 2021, 2023 and 2024 and the Champions Cup in 2021 and 2024.
