shaka
high
WBGL and WBTC can be paused.
In the README file it is stated the following
we don't expect that this contract activity could be paused from outside.
Given that the WBGL and WBTC can be paused, this would not make possible to mint them or used them to rebalance the collateral/USSD in case of a depeg event.
If WBGL or WBTC are paused, the stability mechanisms of the protocol will stop working.
https://github.com/sherlock-audit/2023-05-USSD/blob/main/ussd-contracts/contracts/USSD.sol#L75
Manual Review
Avoid using as collateral tokens that can be paused.