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, having lost approximately $4.55 million on Thursday due to a compromised deployer key, as reported by security firm Blockaid. This recent hack follows a string of incidents in the past month, totaling over $605 million in losses across at least 12 separate incidents. The attack bears a striking resemblance to the Drift Protocol exploit, which occurred on April 1, where attackers utilized a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The exploit was carried out through an externally owned account called wasabideployer.eth, which held the sole admin role in Wasabi's permission system. The attacker gained access to the deployer key and subsequently granted themselves admin privileges without delay by invoking the grantRole function 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 draining of balances, according to 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 rectify bugs without requiring user migration. However, if an attacker gains control of admin permissions, 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 an ongoing admin-key compromise exploit on Wasabi Protocol across Ethereum and Base. The Wasabi Deployer EOA was used to grant the admin role to an attacker helper contract, which then upgraded the perp vaults and LongPool to malicious implementations using UUPS. 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. 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 exceeded $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 repetition of similar post-mortem analyses 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. UPDATE (April 30, 11:34 UTC): General edits have been made throughout, and the Drift Protocol exploit has been moved to the third paragraph.