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

The decentralized finance sector continues to experience significant losses, with Wasabi Protocol being the latest victim. On Thursday, the platform, which is built on Ethereum and Base and offers perpetuals trading, was drained of approximately $4.55 million after its deployer key was compromised, according to security firm Blockaid. This incident is the latest in a series of DeFi losses, which have totaled over $605 million across at least 12 incidents this month. The attack bears a striking resemblance to the Drift Protocol exploit that occurred on April 1, where attackers, linked to North Korea, used a compromised admin key to steal $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 attackers gained access to the deployer key, they granted themselves admin privileges without 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 draining of balances, as reported by Blockaid. The exploit relied on the Universal Upgradeable Proxy Standard (UUPS), which allows a smart contract to change its underlying code without altering its address. While UUPS is widely used for its convenience in fixing 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. 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, providing users with 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 attackers to carry out the exploit. Blockaid's exploit detection system identified the ongoing admin-key compromise exploit on Wasabi Protocol across both Ethereum and Base. 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 total DeFi loss for 2026 has now exceeded $770 million across more than 30 reported incidents, with April accounting for the majority of this 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 repeated exploitation of known weaknesses, with each incident producing the same post-mortem language about lessons learned, only to be followed by the next exploit before these lessons can be implemented. Wasabi Protocol has yet to issue a public statement regarding the incident.