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 is a perpetuals trading platform built 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, totaling over $605 million across at least 12 incidents this month. The attack bears a striking resemblance to the Drift Protocol exploit on April 1, in which North Korea-linked attackers used 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. Once the attacker gained access to the deployer key, they granted themselves admin privileges without delay by calling grantRole on the permission contract. A helper contract then upgraded Wasabi's perp vaults and Long Pool to malicious implementations, draining the balances, as reported by Blockaid. The exploit utilized 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 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. 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 had either been drained or remained at risk. This month has seen a string of exploits, including the Drift Protocol breach, where attackers exploited a single-key admin setup with no governance timelock. On April 19, Kelp DAO lost $292 million when an attacker exploited a single-verifier configuration in the protocol's LayerZero bridge. The cumulative DeFi loss total for 2026 has now surpassed $770 million across more than 30 reported incidents, with April accounting for the majority of this figure. Smaller breaches this month have hit CoW Swap, Grinex, Resolv Labs, and Volo Protocol, among others. A common thread among these incidents is not a new vulnerability but rather the repetition of similar mistakes, with each post-mortem analysis highlighting lessons learned, only for the next exploit to occur before these lessons can be implemented. Wasabi has not yet issued a public statement regarding the incident.