On December 5, 2023, thirdweb, the Web3 base development platform, indicated that a security vulnerability was discovered in pre-built smart contracts. The impacted pre-built contracts include but are not limited to DropERC20, ERC721, ERC1155 (all versions), and AirdropERC20. Please see a full list of impacted smart contracts and mitigation steps at this link (https://blog.thirdweb.com/security-vulnerability/).