Wasabi Protocol Loses $4.5 Million in Apparent Admin Key Breach

The DeFi sector continues to face significant challenges, with Wasabi Protocol being the latest victim of a major security breach. On Thursday, the protocol, which operates as a perpetuals trading platform on Ethereum and Base, suffered a loss of around $4.55 million after its deployer key was compromised, according to security firm Blockaid. This incident marks the latest in a series of DeFi losses, which have exceeded $605 million across at least 12 incidents in the past month. The attack bears a striking resemblance to the Drift Protocol exploit that occurred on April 1, where attackers, linked to North Korea, utilized a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The breach was facilitated through an externally owned account known as wasabideployer.eth, which held the sole ADMIN_ROLE within Wasabi's permission system. This account, controlled by a private key, allowed the attackers to gain admin privileges without any delay by calling grantRole on the permission contract. Subsequently, a helper contract was 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 leveraged the Universal Upgradeable Proxy Standard (UUPS), a widely used standard that enables smart contracts to modify their underlying code while retaining the same address. Although UUPS allows developers to fix bugs without requiring user migration, 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. Notably, Wasabi lacked a timelock or multisig to protect the admin role, leaving a single key in control of the protocol. 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 contracts. 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 were either 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 alone accounting for the majority of this figure. Other 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 existing weaknesses, with each incident producing similar post-mortem analyses about lessons learned, yet the next exploit often occurs before these lessons are implemented. Wasabi has not yet issued a public statement regarding the incident.