Wasabi Protocol Loses $4.5 Million in Suspected Admin Key Breach

The DeFi sector continues to face significant losses, with Wasabi Protocol being the latest victim, losing approximately $4.55 million on Thursday due to a compromised deployer key, as reported by security firm Blockaid. The incident occurred on the perpetuals trading platform, which operates on Ethereum and Base, and is the latest in a series of DeFi losses exceeding $605 million across at least 12 incidents this month. The attack bears a striking resemblance to the Drift Protocol exploit, where North Korea-linked attackers used a compromised admin key to drain $285 million from the Solana-based perpetuals exchange on April 1. The breach was executed through an externally owned account called wasabideployer.eth, which held the sole admin role in Wasabi's permission system. Once attackers gained access to the deployer key, they granted themselves admin privileges without delay by calling grantRole on the permission contract. A helper contract was then used to upgrade Wasabi's perp vaults and Long Pool to malicious implementations, resulting in the draining of balances, according to Blockaid. The exploit utilized the Universal Upgradeable Proxy Standard (UUPS), which allows a smart contract to change its underlying code while retaining the same address. UUPS is widely used for its ability to enable developers to fix bugs without requiring user migration. However, its downside is that if an attacker gains control of admin permissions, they can replace the contract's logic with any code, including that designed to steal funds. Blockaid noted that Wasabi lacked a timelock or multisig to protect the admin role. A timelock would have forced a delay between the announcement and execution of an admin action, providing users with time to react, while a multisig would have required multiple signers to approve changes. The absence of these safeguards left a single key in control of the protocol. 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, according to Blockaid. 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 approximately 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), and Volo Protocol ($3.5 million), among others. A common thread among these incidents is not a new vulnerability but rather the repeated exploitation of known weaknesses. Each incident is followed by the same post-mortem language about lessons learned, but the next exploit usually occurs before these lessons are implemented. Wasabi has yet to issue a public statement regarding the incident. UPDATE (April 30, 11:34 UTC): General edits throughout. Moves Drift Protocol exploit to third paragraph.