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

The decentralized finance (DeFi) sector continues to experience significant losses, with Wasabi Protocol being the latest victim. On Thursday, the platform, 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, totaling over $605 million across at least 12 incidents this month. The attack bears a striking resemblance to the Drift Protocol exploit, which occurred on April 1, where North Korea-linked attackers utilized a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The perpetrator of the Wasabi Protocol hack exploited the deployer key, held by an externally owned account (EOA) called wasabideployer.eth, which possessed the sole ADMIN_ROLE in Wasabi's permission system. By gaining access to the deployer key, the attacker was able to grant themselves admin privileges without any delay by calling grantRole on the permission contract. Subsequently, a helper contract was 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 leveraged the Universal Upgradeable Proxy Standard (UUPS), a widely used standard that allows smart contracts to change their underlying code while retaining the same address. However, the lack of a timelock or multisig protecting the admin role left Wasabi vulnerable to the attack, as a single key held full control over 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 have been advised to revoke any active approvals to the vault contracts, as the underlying assets backing those tokens have either been drained or remain 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, and the Kelp DAO incident, where 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 that figure. Smaller breaches this month have also occurred, including CoW Swap, Grinex, Resolv Labs, and Volo Protocol, among others. A common thread among these incidents is the lack of implementation of lessons learned, despite the familiar post-mortem language. Wasabi has yet to issue a public statement regarding the incident.