Wasabi Protocol Loses $4.5 Million in Apparent Admin Key Breach

The DeFi sector continues to suffer significant losses, with Wasabi Protocol being the latest victim. On Thursday, the protocol, which operates as a perpetuals trading platform on Ethereum and Base, was drained of approximately $4.55 million after its deployer key was compromised, according to security firm Blockaid. This incident follows a string of DeFi losses totaling over $605 million across at least 12 incidents this month, with the most recent attack bearing a striking resemblance to the Drift Protocol exploit on April 1. In the Drift Protocol breach, attackers linked to North Korea used a compromised admin key to steal $285 million from the Solana-based perpetuals exchange. The Wasabi Protocol hack was carried out through 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 without any 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 leveraged the Universal Upgradeable Proxy Standard (UUPS), which allows a smart contract to change its underlying code without altering its 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. According to Blockaid, Wasabi Protocol lacked a timelock or multisig to protect the admin role, leaving a single key with full control over the protocol. A timelock would have enforced a delay between the announcement and execution of an admin action, providing users with time to react, while a multisig would have required multiple signers to approve changes. The absence of these security measures made it easier for the attackers to carry out the exploit. 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 series 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, resulting in a $292 million loss. 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 breaches this month include CoW Swap ($1.2 million), Grinex ($13.74 million), Resolv Labs ($23 million), and Volo Protocol ($3.5 million), 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 attack often occurring before any changes are made. Wasabi Protocol has yet to issue a public statement regarding the incident.