How much was lost in the Wise Lending V2 hack?

The Wise Lending V2 hack resulted in $66K in losses on February 28, 2026.

What attack technique was used in the Wise Lending V2 exploit?

The Wise Lending V2 exploit utilized Flashloan Exploit / Improper Access Control. Understanding this attack vector is critical for smart contract auditors and developers building secure DeFi protocols.

How can developers prevent similar smart contract attacks?

Preventing smart contract hacks requires a combination of secure coding practices, thorough security audits, and understanding common attack vectors like reentrancy, oracle manipulation, and access control flaws. Smart Contract Hacking (SCH) provides hands-on training to help developers and auditors identify and prevent vulnerabilities before deployment.

Wise Lending V2 Hack

TOTAL LOST $66K

Low Feb 28, 2026 Flashloan Exploit / Improper Access Control arbitrum ethereum

Affected Chain arbitrum 2 chains affected

Recovered - No recovery reported

All-Time Rank #2020 By amount stolen

Auditors 3 Prior security audits

Incident Overview

Wise Lending is both a crypto lending platform and a yield-farm aggregator. This combination allows capital from lenders to be leveraged towards other yield-farming dApps

This is classified as a Access Control Attacks, Flash Loan Attacks . Compare similar hacks →

Incident Report

Protocol / Project Wise Lending V2

Date of Incident February 28, 2026

Affected Chain(s) arbitrum ethereum

Attack Technique Flashloan Exploit / Improper Access Control

Classification Protocol Logic / Access Control

Protocol Information

Protocol Type Lending

Smart Contract Language Solidity

Protocol Twitter/X @WiseLending

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Operational-security tradecraft (phishing, malware, leaked seed phrases, or insider access) to obtain treasury signing authority

Capital Required Minimal capital - only enough to cover gas while draining the compromised accounts

On-Chain Access Valid signing authority over the compromised wallets / multisig signers, allowing direct transfer of funds or stake authorization

Target Reconnaissance Identification of Wise Lending V2's high-value treasury accounts and the authority / multisig structure controlling them

Execution Speed Speed to drain the compromised accounts before the team detects the breach and revokes signing authority or freezes the assets

Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Likely, with a thorough Flashloan Exploit / Improper Access Control audit checklist and test coverage

Audited by Audit Report 1, Audit Report 2, Audit Report 3, still lost $66K. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Wise Lending V2, these are the critical security checks that could have prevented this incident (February 2026).

Verify all logic paths related to Flashloan Exploit / Improper Access Control are guarded by proper access controls and input validation - see the Access Control Attacks attack class for patterns
Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.

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Security Audit History

Audit Report 1 Report
Audit Report 2 Report
Audit Report 3 Report

Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Access Control Attacks examples →

Access Control Attacks Flash Loan Attacks

Threat Assessment

Severity Level

LOW

Attack Vector Flashloan Exploit / Improper Access Control
Root Cause Protocol Logic / Access Control
Year 2026

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