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, losing around $4.55 million on Thursday due to a compromised deployer key, as reported by security firm Blockaid. This incident bears a striking resemblance to the Drift Protocol exploit, which occurred on April 1 and saw $285 million drained from the Solana-based perpetuals exchange by North Korea-linked attackers using a compromised admin key. The attack on Wasabi Protocol was carried out through an externally owned account called wasabideployer.eth, which held the sole ADMIN_ROLE in the protocol's permission system. Once the attackers gained access to the deployer key, they granted themselves admin privileges and upgraded Wasabi's perp vaults and Long Pool to malicious implementations, resulting in the draining of balances. The exploit took advantage of the Universal Upgradeable Proxy Standard (UUPS), which allows smart contracts to change their underlying code without altering their address. However, this standard also poses a 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 made it vulnerable to this type of attack. Blockaid's exploit detection system identified the ongoing admin-key compromise exploit, which involved the Wasabi: Deployer EOA granting ADMIN_ROLE to an attacker helper contract. This contract then UUPS-upgraded the perp vaults and LongPool to malicious implementations. 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 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 incident is part of a larger trend of DeFi exploits, with over $605 million lost across at least 12 incidents in the past month. The cumulative DeFi loss total for 2026 has now surpassed $770 million, with April alone accounting for the majority of this figure. Smaller breaches this month have affected CoW Swap, Grinex, Resolv Labs, and Volo Protocol, among others. A common thread among these incidents is the lack of implementation of lessons learned, with each exploit producing similar post-mortem language but the next incident often occurring before any changes are made. Wasabi has yet to issue a public statement on the incident.