Wasabi Protocol Loses $4.5 Million Due to Apparent Admin Key Compromise

The DeFi sector continues to experience significant losses, with Wasabi Protocol being the latest to fall victim to a major exploit. On Thursday, the protocol, which is a perpetuals trading platform built on Ethereum and Base, 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 that 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, in which North Korea-linked attackers utilized 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 attackers gained access to the deployer key, they granted themselves admin privileges with zero 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 that drained the balances, as reported by Blockaid. The exploit relied on the Universal Upgradeable Proxy Standard, which allows a smart contract to change its underlying code while maintaining the same address. Although this standard is widely used as it enables developers to fix bugs without migrating users, it also has a significant downside: if an attacker gains control of admin permissions, they can replace the contract's logic with any code they desire, including code designed to steal funds. Unfortunately, Wasabi had no timelock or multisig in place to protect the admin role, leaving a single key with 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, in which attackers exploited a single-key admin setup with no governance timelock, and the Kelp DAO incident, in which 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 alone accounting for the majority of that 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 same post-mortem language about lessons learned, only to be followed by the next exploit before the lessons can be implemented. Wasabi has yet to issue a public statement regarding the incident.