Wasabi Protocol Loses $4.5 Million Due to Admin Key Breach

The DeFi sector continues to experience significant losses, with Wasabi Protocol being the latest victim, having lost approximately $4.55 million on Thursday due to a compromised deployer key, according to security firm Blockaid. The incident occurred on the perpetuals trading platform built on Ethereum and Base, marking 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 on April 1, in which North Korea-linked attackers utilized a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The breach was facilitated through an externally owned account (EOA) called wasabideployer.eth, which held the sole ADMIN_ROLE in Wasabi's permission system. The EOA, controlled by a private key, granted the attacker admin privileges with zero delay by calling grantRole on the permission contract, allowing them to upgrade Wasabi's perp vaults and Long Pool to malicious implementations that drained the balances. The exploit leveraged the Universal Upgradeable Proxy Standard (UUPS), a widely used standard that enables smart contracts to change their underlying code while retaining the same address. Although UUPS allows developers to fix bugs without migrating users, it also poses a significant risk if an attacker gains control of admin permissions, as they can replace the contract's logic with malicious code designed to steal funds. According to Blockaid, Wasabi lacked a timelock or multisig to protect the admin role, leaving a single key in control of the protocol. A timelock would have forced a delay between the announcement and execution of admin actions, providing users with a window to react, while a multisig would have required multiple signers to approve changes. Blockaid's exploit detection system identified an ongoing admin-key compromise exploit on Wasabi Protocol across Ethereum and Base, resulting in the UUPS-upgrade of perp vaults and LongPool to malicious contracts. 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 series of exploits, including the Drift Protocol breach, which also involved a single-key admin setup with no governance timelock. On April 19, Kelp DAO lost $292 million due to an attacker exploiting 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 alone 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 repeated exploitation of existing weaknesses, with each incident producing similar post-mortem language about lessons learned, only to be followed by another exploit before the lessons can be 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.