When liquidating a position, spot prices are used to check if indeed the position is liquidatable.
Spot prices in whatever provider are always the latest/easiest manipulatable point of pricing which then means that if a manipulated price is returned a user could be unfairly liquidated.
Alternatively, a malicious liquidator could take these steps using one of the decentralised providers:
Borderline low/medium. This seems as a design choice, but it could cause for unfair liquidations for users.
Consider using a TWAP logic when liquidating.
