Included in the Tales from the Yawning Portal, The Hidden Shrine of Tamoachan adventure has some Cursed Treasure in area 29: "The Tomb of Pelota" (pg. 78)
Cursed Treasure. If any treasure is removed from the pit, a curse will fall upon its bearer 1 hour later. The victim must succeed on a DC 15 saving throw, or it has disadvantage on Strength and Dexterity ability checks and saving throws until the curse is dispelled.
What kind of saving throw is needed, by which I mean what ability does it use? The adventure text doesn't say.
Can the PCs make either Strength or Dexterity saving throws because those are the abilities affected by the curse? That doesn't make much sense, since usually curses are resisted by mental stats...