There isn't an end time on FixedPrice and LPDA sales, and the sale can't be canceled after the sale start.

Lines of code Vulnerability details Impact The sale can't be canceled after the sale start. Moreover, the sale won't end, which contradict the fact that typical NFT sales nowadays have an end time. Even your OpenEdition have an end time. Proof of Concept struct Sale // slot 1 uint48 currentId;...

Buy can be executed after sale end

Lines of code Vulnerability details Impact In LPDA.sol buy function when all tokens are minted, the final price is set and the ether from the sale and fee is sent to the saleReceiver and feeReceiver addresses. Since there is no check to validate if sale has ended the function can be executed with...