Wasabi Protocol Loses $4.5 Million in Apparent Admin Key Breach

The DeFi sector continues to experience significant losses, with Wasabi Protocol being the latest victim, drained of approximately $4.55 million on Thursday following a deployer key compromise, according to security firm Blockaid. The incident occurred on the perpetuals trading platform built on Ethereum and Base, marking another major loss in a month that has seen over $605 million in DeFi losses across at least 12 incidents. The attack bears resemblance to the Drift Protocol exploit, where North Korea-linked attackers utilized a compromised admin key to drain $285 million from the Solana-based perpetuals exchange on April 1. The exploit was executed through an externally owned account called wasabideployer.eth, holding the sole ADMIN_ROLE in Wasabi's permission system. This account, controlled by a private key, allowed the attacker to gain admin privileges without delay by calling grantRole on the permission contract. The attacker then upgraded Wasabi's perp vaults and Long Pool to malicious implementations, draining the balances, as reported by Blockaid. The exploit leveraged the Universal Upgradeable Proxy Standard (UUPS), which enables a smart contract to change its underlying code while retaining the same address. UUPS is widely adopted due to its ability to allow developers to fix bugs without migrating users. However, it also poses a risk if an attacker gains admin permissions, as they can replace the contract's logic with malicious code designed to steal funds. Wasabi lacked a timelock or multisig to protect the admin role, according to Blockaid. A timelock would have forced a delay between the announcement and execution of an admin action, giving users time to react, while a multisig would have required multiple signers to approve changes. The absence of these security measures left a single key in control of the protocol. Blockaid's exploit detection system identified an ongoing admin-key compromise exploit on Wasabi Protocol across Ethereum and Base. The Wasabi Deployer EOA was used to grant ADMIN_ROLE to an attacker helper contract, which then UUPS-upgraded the perp vaults and LongPool to malicious implementations. 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. A series of exploits has plagued the DeFi sector this month. In addition to the Wasabi and Drift incidents, Kelp DAO lost $292 million on April 19 when an attacker exploited a single-verifier configuration in the protocol's LayerZero bridge. The cumulative DeFi loss total for 2026 has 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 same post-mortem language about lessons learned, only to be followed by another exploit before the lessons are implemented. Wasabi has yet to issue a public statement regarding the incident.