Submitted by Trust
https://github.com/code-423n4/2022-11-paraspace/blob/c6820a279c64a299a783955749fdc977de8f0449/paraspace-core/contracts/protocol/libraries/types/DataTypes.sol#L296
In ParaSpace marketplace, taker may pass makers signature and fulfil their bid with takers NFT. The maker can use credit loan to purchase the NFT provided the health factor is positive in the end.
In validateAcceptBidWithCredit, verifyCreditSignature  is called to verify maker signed the credit structure.
The issue is that the credit structure does not have a marketplace identifier:
As a result, attacker can use the victims signature for some orderId in a particular marketplace for another one, where this orderId leads to a much lower valued item.
User would borrow money to buy victims valueless item. This would be HIGH impact, but incidentally right now only the SeaportAdapter marketplace supports credit loans to maker (implements matchBidWithTakerAsk). However, it is very likely the supporting code will be added to LooksRareAdapter and X2Y2Adapter as well.
LooksRareExchange supports the function out of the box:
So, this impact would be HIGH but since it is currently not implemented, would downgrade to MED. I understand it can be closed as OOS due to speculation of future code, however I would ask to consider that the likelihood of other Exchanges supporting the required API is particularly high, and take into account the value of this contribution.
Attacker can abuse victims signature for marketplace bid to buy worthless item.
Credit structure should contain an additional field MarketplaceAddress.
