Wasabi Protocol Loses $4.5 Million in Apparent Admin Key Breach

The DeFi space continues to experience significant losses, with Wasabi Protocol being the latest victim, losing approximately $4.55 million on Thursday due to a compromised deployer key, as reported by security firm Blockaid. This recent hack follows a string of incidents this month, resulting in over $605 million in DeFi losses across at least 12 separate incidents. The attack on Wasabi Protocol bears a striking resemblance to the Drift Protocol exploit, which occurred on April 1 and saw North Korea-linked attackers use 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. The attacker, having gained access to the deployer key, granted themselves admin privileges with no delay by calling grantRole on the permission contract. Subsequently, a helper contract was used to upgrade Wasabi's perp vaults and Long Pool to malicious implementations, effectively draining the balances, according to Blockaid. The exploit leveraged the Universal Upgradeable Proxy Standard (UUPS), which allows a smart contract to modify its underlying code without changing its address. UUPS is widely adopted due to its ability to enable developers to rectify bugs without requiring users to migrate. However, this flexibility also introduces a significant risk: if an attacker gains control of admin permissions, they can replace the contract's logic with malicious code designed to steal funds. In the case of Wasabi Protocol, the absence of a timelock or multisig to protect the admin role created a single point of failure. A timelock would have enforced a delay between the announcement and execution of an admin action, providing users with a window to respond. Similarly, a multisig would have required multiple signers to approve any changes, thereby preventing a single key from holding absolute control over the protocol. The exploit detection system employed by Blockaid identified an ongoing admin-key compromise exploit on Wasabi Protocol across both Ethereum and Base. The Wasabi: Deployer EOA was utilized to grant ADMIN_ROLE to an attacker-controlled helper contract, which then UUPS-upgraded the perp vaults and LongPool to malicious implementations. 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 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. A series of exploits has plagued the DeFi space this month, with the Drift exploit also resulting from a single-key admin setup with no governance timelock. The attackers listed a fake token as collateral and raised withdrawal limits to drain real assets in approximately 12 minutes. On April 19, Kelp DAO lost $292 million when an attacker exploited a single-verifier configuration in the protocol's LayerZero bridge, releasing 116,500 unbacked rsETH that was then used as collateral to borrow real ether (ETH) from Aave. The cumulative DeFi loss total for 2026 has now exceeded $770 million across more than 30 reported incidents, with April alone accounting for the majority of this figure. Other notable 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 not a new vulnerability, but rather the consistent failure to implement lessons learned from previous exploits, allowing attackers to continue exploiting the same weaknesses. Wasabi Protocol has yet to issue 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.