Wasabi Protocol Loses $4.5 Million Due to Apparent Admin Key Breach

The DeFi sector continues to experience significant losses, with the latest incident involving the Wasabi Protocol, a perpetuals trading platform built on Ethereum and Base, which was drained of around $4.55 million on Thursday after its deployer key was compromised, according to security firm Blockaid. This breach is the latest in a series of incidents that have resulted in over $605 million in DeFi losses across at least 12 incidents this month. The attack bears a striking resemblance to the Drift Protocol exploit, which occurred on April 1 and saw North Korea-linked attackers use a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The mechanics of the attack involved an externally owned account called wasabideployer.eth, which held the sole ADMIN_ROLE in Wasabi's permission system. Once the attacker gained access to the deployer key, they granted themselves admin privileges with zero delay by calling grantRole on the permission contract. A helper contract then upgraded Wasabi's perp vaults and Long Pool to malicious implementations that drained the balances, as reported by Blockaid. The exploit relied on the Universal Upgradeable Proxy Standard (UUPS), which allows a smart contract to change its underlying code while maintaining the same address. UUPS is widely used as it enables developers to fix bugs without migrating users, but it also has a downside: if an attacker controls admin permissions, they can replace the contract's logic with anything they want, including code designed to steal funds. Wasabi lacked a timelock or multisig to protect the admin role, leaving a single key with full control over the protocol. Blockaid's exploit detection system identified an ongoing admin-key compromise exploit on the Wasabi Protocol across Ethereum and Base. The compromised contracts include Wasabi's wWETH, sUSDC, wBITCOIN, wPEPE, and Long Pool vaults on Ethereum, as well as its sUSDC, wWETH, sBTC, sVIRTUAL, sAERO, and sBRETT vaults on Base. Users holding Wasabi LP tokens were advised to revoke any active approvals to the vault contracts, as the underlying assets backing those tokens had either been drained or remained at risk. This month has seen a string of exploits, including the Drift Protocol breach, where attackers exploited a single-key admin setup with no governance timelock, listing a fake token as collateral and raising withdrawal limits to drain real assets in roughly 12 minutes. On April 19, Kelp DAO lost $292 million when an attacker exploited a single-verifier configuration in the protocol's LayerZero bridge, releasing 116,500 unbacked rsETH that was then used as collateral to borrow real ether (ETH) from Aave. The cumulative DeFi loss total for 2026 has now surpassed $770 million across more than 30 reported incidents, with April accounting for the majority of that figure. Smaller breaches this month have hit CoW Swap ($1.2 million), Grinex ($13.74 million), Resolv Labs ($23 million), Volo Protocol ($3.5 million), among others. A common thread among these incidents is not a new vulnerability, but rather the same post-mortem language about lessons learned, only for the next exploit to occur before those lessons can be implemented. Wasabi has not yet issued a public statement on the incident.