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

The DeFi sector continues to experience significant financial losses, with Wasabi Protocol being the latest victim. On Thursday, the platform, which is a perpetuals trading platform built on Ethereum and Base, was drained of around $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 that have exceeded $605 million across at least 12 incidents in the past month. The attack closely resembles the Drift Protocol exploit that occurred on April 1, in which North Korea-linked attackers utilized a compromised admin key to steal $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. The attacker then upgraded Wasabi's perp vaults and Long Pool to malicious implementations, resulting in the draining of the balances, as stated 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. However, if an attacker gains control of 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, according to Blockaid. A timelock forces a delay between when an admin action is announced and when it is executed, providing users with time to react. A multisig requires multiple signers to approve a change. Wasabi had neither, leaving a single key holding full control over 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 urged 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 incident is part of a larger trend of DeFi exploits that have resulted in significant financial losses. In the case of Drift, the attackers also 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. Three weeks later, 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 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. What ties these incidents together is not a new vulnerability, but rather the repeated exploitation of existing weaknesses. Each incident produces the same post-mortem language about lessons learned, but the next exploit usually occurs before the lessons are implemented. Wasabi has not yet issued a public statement on the incident.