Wasabi Protocol Suffers $4.5 Million Loss Due to Admin Key Breach

The DeFi sector continues to experience significant losses, with Wasabi Protocol being the latest victim. On Thursday, the platform, which is a perpetuals trading platform built on Ethereum and Base, lost approximately $4.55 million after its deployer key was compromised, according to a report by security firm Blockaid. This incident is the latest in a series of DeFi losses, which have exceeded $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. The breach was made possible by 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 without any 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 drainage of balances, as reported by Blockaid. The exploit took advantage of the Universal Upgradeable Proxy Standard (UUPS), which allows a smart contract to change its underlying code while retaining the same address. Although UUPS is widely used for its convenience in fixing 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 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 made it possible for the attacker to compromise the protocol with a single key. Blockaid's exploit detection system identified the ongoing admin-key compromise exploit on Wasabi Protocol across Ethereum and Base, where 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. 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, 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. Other smaller breaches this month include 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 not yet issued a public statement regarding the incident.