Gnosis Pay Hack

TOTAL LOST $1.5M
Medium Signature Verification Flaw gnosis chain
Affected Chain gnosis chain Incident surface
Recovered - No recovery reported
All-Time Rank #864 By amount stolen
Year 2026 Incident year

Incident Report

Protocol / Project Gnosis Pay
Date of Incident
Affected Chain(s) gnosis chain
Attack Technique Signature Verification Flaw
Classification Input Validation

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 Deep understanding of signature verification flaw and Solidity and EVM internals
Capital Required Seed capital to cover gas and initial position setup
On-Chain Access Ability to interact with gnosis chain smart contracts and deploy a custom exploit contract
Protocol Analysis Identification of the exploitable vulnerability in Gnosis Pay's contract logic - root cause: input validation
Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single atomic block
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 Signature Verification Flaw audit checklist and test coverage

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

  • Verify all logic paths related to Signature Verification Flaw are guarded by proper access controls and input validation
  • 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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