An attack on the Base blockchain has led to a loss of approximately $219,000, equivalent to 55 WETH, from an unknown contract. BlockSec Phalcon monitoring detected the attack transaction, which exploited improper access control, allowing unauthorized `transferFrom` calls. Users are advised to immediately revoke all authorizations to the contract address 0xE143b486ab0413Df0D6DAd2caf6d2f61CAC54730 and refrain from granting new permissions to this address.