In Comptroller.sol, it is mentioned that closeFactorMantissa should be greater than closeFactorMinMantissa and less than closeFactorMaxMantissa. But in _setCloseFactor, these are not checked, meaning closeFactorMantissa can be set to a value outside the boundaries defined by the protocol.
Instances include:
Add checks in _setCloseFactor to ensure closeFactorMantissa is greater than closeFactorMinMantissa and less than closeFactorMaxMantissa.
