Wasabi Protocol Loses $4.5 Million to 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 on Ethereum and Base, was drained of about $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 this month, totaling over $605 million across at least 12 incidents. The attack bears a striking resemblance to the Drift Protocol exploit, which occurred on April 1, where attackers used a compromised admin key to drain $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 no 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 while maintaining the same address. Although UUPS is widely used for its convenience in fixing bugs without migrating users, it 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. Wasabi's lack of a timelock or multisig to protect the admin role was a critical vulnerability, as a timelock would have forced a delay between the announcement and execution of an admin action, giving users 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. Blockaid's exploit detection system identified the ongoing admin-key compromise exploit on Wasabi Protocol across 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, and Kelp DAO, which lost $292 million due to a single-verifier configuration in its LayerZero bridge. 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 this figure. Other smaller breaches this month include CoW Swap, Grinex, Resolv Labs, and Volo Protocol. 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 the lessons can be implemented. Wasabi Protocol has not yet issued a public statement regarding the incident.