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

The DeFi sector continues to face significant losses, with Wasabi Protocol being the latest victim, losing approximately $4.55 million on Thursday after its deployer key was compromised, according to security firm Blockaid. This incident marks another major loss in a month that has seen over $605 million in DeFi losses across more than 12 incidents. The attack bears a striking resemblance to the Drift Protocol exploit on April 1, where attackers used a compromised admin key to drain $285 million from the Solana-based perpetuals exchange. The breach was made possible 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 delay and upgraded 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), 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. Wasabi's lack of a timelock or multisig to protect the admin role made it vulnerable to the attack, Blockaid noted. A timelock would have introduced 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 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 had either been drained or remained at risk. The past 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 Kelp DAO's loss of $292 million due to a single-verifier configuration in its LayerZero bridge. 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 smaller breaches this month include CoW Swap, Grinex, Resolv Labs, and Volo Protocol. A common thread among these incidents is not a new vulnerability but rather the repeated exploitation of known security weaknesses. While each incident prompts discussions about lessons learned, the next exploit often occurs before these lessons can be implemented. Wasabi Protocol has not yet released a public statement regarding the incident. UPDATE (April 30, 11:34 UTC): General edits have been made throughout, and the Drift Protocol exploit has been moved to the third paragraph.