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

The DeFi sector continues to experience significant losses, with Wasabi Protocol being the latest victim. On Thursday, the platform, 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 exceeded $605 million across at least 12 incidents this month. The attack mirrors the Drift Protocol exploit that occurred on April 1, where 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 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, resulting in the draining of the balances, as stated by Blockaid. The exploit relied on 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 migrating users, 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 lacked a timelock or multisig to protect the admin role. A timelock would have forced a delay between the announcement and execution of an admin action, giving users time to react, while a multisig would have required multiple signers to approve a change. The absence of these security measures left a single key in control of the protocol. Blockaid's exploit detection system identified an 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 were either drained or remained 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. 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 that figure. Other smaller breaches this month include 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 post-mortem language about lessons learned, only to be followed by another exploit before those lessons can be implemented. Wasabi Protocol has not yet issued a public statement regarding the incident.