An attacker minted 10 million CYS tokens and successfully moved approximately $727,000 in proceeds to Ethereum, prompting Cysic to suspend bridge operations. The exploit followed a familiar playbook: inflate the supply, cash out through multiple cross-chain routes before anyone can freeze the exits.
The funds traveled through Mayan, deBridge, and SWFT’s Bridgers, three separate bridge protocols used in succession, a method that complicates tracking and splits the paper trail across platforms. By the time Cysic pulled the emergency brake, the attacker had already converted a token inflation event into mainnet ETH.
Minting Vulnerabilities Remain a Bridge Problem
This isn’t the first time an attacker has weaponized cross-chain infrastructure to launder freshly minted tokens. The pattern repeats: compromise a contract or exploit a minting function, dump the tokens for stablecoins or liquid assets, then bridge out before the issuer can coordinate a response. Bridges, by design, don’t have visibility into whether tokens arriving at their doorstep are legitimate or the product of a supply exploit. They move what they’re asked to move.
Cysic’s decision to suspend the bridge came after the damage was done. The attacker had already executed the core strategy, turn protocol control into off-chain liquidity. What remains on the Cysic side is a diluted token supply and the question of whether the minting function itself was the vulnerability or whether broader access controls failed.
Three Bridges, One Exit
Using Mayan, deBridge, and SWFT’s Bridgers in sequence suggests the attacker prioritized speed and redundancy over stealth. Each bridge offers different liquidity pools and settlement times; stacking them creates optionality if one route fails or freezes. It also fractures the trail for anyone trying to follow the funds in real time.
The $727,000 figure represents what made it to Ethereum, not necessarily the total value extracted. Some portion may have been lost to slippage, bridge fees, or abandoned in intermediate hops. What’s clear is that the attacker understood the infrastructure well enough to execute a multi-hop exit under pressure.
Cysic hasn’t disclosed whether the minting exploit originated from a smart contract bug, a compromised admin key, or something else. The bridge suspension buys time, but the tokens are already across the chain divide. Recovery, if it happens at all, will depend on cooperation from exchanges and chain analytics firms, and whether the attacker makes a mistake downstream.
