Symbiosis BSC Bridge Exploited as Attacker Collects $340K

On-chain security firm Blockaid reported an exploit on the BNB Chain (BSC) bridge of cross-chain protocol Symbiosis (Symbiosis). The attacker exploited signed receive requests in BridgeV2 to mint an abnormal amount of 4.61 billion syBTC to a new address. Blockaid explained that the attacker sold approximately 4.39 WBTC on Ethereum's Uniswap V4, collecting around $336,000 to date.