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. On Thursday, the protocol, which operates as a perpetuals trading platform on Ethereum and Base, was drained of about $4.55 million after its deployer key was compromised, according to a report by security firm Blockaid. This incident follows a string of DeFi losses totaling over $605 million across at least 12 incidents in the past month. The attack on Wasabi Protocol bears a striking resemblance to the Drift Protocol exploit that occurred 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) known as wasabideployer.eth, which held the sole ADMIN_ROLE within Wasabi's permission system. An EOA is a wallet controlled by a private key, as opposed to a smart contract, and the holder of the key has control over the wallet. Once the attackers gained access to the deployer key, they granted themselves admin privileges without delay by calling grantRole on the permission contract. Subsequently, their helper contract upgraded Wasabi's perp vaults and Long Pool to malicious implementations, resulting in the draining of balances, as reported by Blockaid. The exploit leveraged the Universal Upgradeable Proxy Standard (UUPS), which enables a smart contract to modify its underlying code while retaining the same address. UUPS is widely adopted due to its ability to allow developers to fix bugs without requiring user migration. However, the downside of this standard is that if an attacker gains control of admin permissions, they can replace the contract's logic with any code they desire, including that designed to steal funds. Blockaid noted that Wasabi lacked a timelock or multisig to protect the admin role. A timelock would have enforced a delay between the announcement and execution of an admin action, providing users with time to react, while a multisig would have required multiple signers to approve a change. The absence of these security measures left a single key in control of 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 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 the case of Drift, the 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. 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 this figure. Smaller breaches this month have affected 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 exploitation of existing weaknesses. Each incident yields the same post-mortem language about lessons learned, yet the next exploit often occurs before these lessons can be implemented. Wasabi has not yet issued a public statement regarding the incident. UPDATE (April 30, 11:34 UTC): General edits have been made throughout, and the Drift Protocol exploit has been moved to the third paragraph.