Moonwell is an open lending, borrowing, and decentralized finance protocol built on Moonbeam and Moonriver. Moonwell’s composable design can accommodate a full range of DeFi applications in the greater Polkadot and Kusama (DotSama) ecosystem.

Maximum Bounty
Live Since
16 February 2022
Last Updated
29 April 2024
  • PoC required

  • KYC required

Submit a Bug

Rewards by Threat Level

Smart Contract
Up to USD $250,000
USD $15,000 to USD $20,000
Up to USD $1,000
Websites and Applications
Up to USD $25,000
Up to USD $10,000

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System V2.2. This is a simplified 5-level scale, with separate scales for websites/apps and smart contracts/blockchains, encompassing everything from consequence of exploitation to privilege required to likelihood of a successful exploit.

All web/app bug reports must come with a PoC in order to be considered for a reward. For smart contract bug reports, a PoC is required in order to determine if the bug exists, and to calculate the extent of the damage the bug could have if exploited.

The payout for smart contract vulnerabilities is dependent on the amount of funds at risk due to the vulnerability, which will be determined by the maximum value of funds at risk in the contract(s) that are impacted on the date of submission of the report.

The following ratio will apply to the payouts for smart contract vulnerabilities, based on the maximum value at risk on the date of submission:

  • Less than $5,000,000 - 10% of bounty for that category
  • Between $5,000,000 and $10,000,000 - 25%
  • Between $10,000,000 and $50,000,000 - 50%
  • Between $50,000,000 and $250,000,000 - 75%
  • Above $250,000,000 - 100%

All web/app bug reports must come with a PoC with an end-effect impacting an asset-in-scope in order to be considered for a reward. Explanations and statements are not accepted as PoC and code is required. An invoice is required for payment to be made.

The Lunar Technology Foundation requires KYC to be completed by all researchers submitting a report before a bounty can be paid. The information needed is an ID scan along with a selfie to verify identity.

Current and past contractors or employees of Lunar Labs, Solidity Labs and Moonwell Foundation are not eligible for any rewards from this bug bounty program.

The following are known issues and therefore are out of scope:

  • Borrowing rewards for markets where a reward speed is not set do not accrue without a user calling claim (or someone calling claimBehalf).
  • When setting reward speed = 0 and turning it back on for a market, rewards will accrue as if the new rate was always on.
  • Assets which are supplied which a user hasn’t called ‘enterMarkets’ for can still be seized. This is working as designed.
  • New markets must be added with no collateral factor, and some small amount of the collateral token supply must be burned in order to avoid market manipulation. This is a known issue.
  • Wormhole dependency: If wormhole goes offline, or pauses their relayer or wormhole core contracts, the Multichain Governor and Vote Collector will not be able to function. This is because the Multichain Governor passes messages to the Wormhole contract, and the Vote Collector receives messages from the Wormhole Relayer. If Wormhole is offline, on either chain, the system is considered broken and will not function.
  • If users have proposals in flight, and the max user live proposals variable is updated to be less than its current value, the system invariant live proposals <= maxUserLiveProposals can be temporarily violated.
  • Quorum can be updated to zero, and if it is, then a proposal with a single for vote can pass.
  • Setting too high of a quorum also means that a proposal is unlikely to ever be able to pass. This is because the system will not be able to reach quorum, and all proposals will go to the Defeated state.
  • Gas limit can be updated through a governance proposal, and if an external chain has their opcodes repriced higher, and the governance contract does not update its gas limit, then the system can be broken. This is because the system will not be able to process any transactions on the external chain, and the system will be unable to process any governance proposals. To mitigate this, the governor would use the break glass guardian to recover system ownership. Alternatively, a governance proposal could occur on Moonbeam to update the gas limit. However, users on Base would not be able to participate until this vote passed and the proposal was bridged to Base.
  • Because this governance system straddles two chains, it is important that the timestamps on both chains are within one minute of each other to prevent issues around double voting. If an external chain has timestamps more than one minute behind Moonbeam, then a user could propose a change on Moonbeam, and then bridge their tokens to the external chain. This would mean once voting opened up, it would look like this user has double the voting power than they should have. This is because the system would register their votes on both Moonbeam and the external chain as valid.
  • if the Pause Guardian is malicious, they could wait for a governance proposal to grant another guardian the ability to pause the contract, then pause the contract, clearing this proposal from the active set of proposals. Then the community would need to wait 30 days before they could create, vote on and pass another proposal again.
  • if the vote collection contracts on other chains are malicious, they could prevent the Multichain Governor from executing proposals, or pass proposals that are failing by registering incorrect vote counts.
  • if Wormhole is paused or offline, the Multichain Governor will still be able to execute and pass proposals, however, users on other chains will not be able to submit or have their votes collected.
  • if Wormhole becomes malicious, it could register incorrect vote counts or prevent the Multichain Governor from executing proposals.
  • Approved calldata is correctly set for the Break Glass Guardian. Incorrect calldata could allow the Break Glass Guardian to call any function on any contract. Side effects of incorrect configuration include but are not limited to:
    • complete loss of governance abilities on both Base and or Moonbeam deployments
    • setting of incorrect oracle data
    • arbitrary changes to governance parameters
  • The block timestamp does not differ by more than 45 seconds between Moonbeam and the external chain:
    • at a larger time difference than 45 seconds, the vote collection contract is at risk of allowing users to register double votes by first voting on Moonbeam, and then bridging to and voting on an external chain.
  • The Wormhole bridge is live and working properly.
    • if Wormhole is paused or offline, the Vote Collection contract will still be able to collect votes, however, votes will not be able to be sent to the Multichain Governor.
    • if Wormhole becomes malicious, it could prevent the Vote Collection contract from collecting votes by blocking a new valid proposal from being registered.
  • No bounties will be paid for issues that arise from a governor turning malicious. Instead, the researcher must demonstrate how the code is vulnerable without using known issues and provide a working PoC of the exploit to demonstrate this vulnerability.

Rewards for critical smart contract vulnerabilities are further capped at 10% of economic damage, with the main consideration being the funds affected in addition to PR and brand considerations, at the discretion of the team. However, there is a minimum reward of USD 100 000 for Critical bug reports.

Payouts are handled by the Moonwell team directly and are denominated in USD. Payouts will be done in USDC or USDT, at the discretion of the team.

Program Overview

Moonwell is an open lending, borrowing, and decentralized finance protocol built on Moonbeam and Moonriver. Moonwell’s composable design can accommodate a full range of DeFi applications in the greater Polkadot and Kusama (DotSama) ecosystem.

For more information about Moonwell, please visit

This bug bounty program is focused on their smart contracts, website and app and is focused on preventing:

  • Loss of protocol or user funds
  • Smart contract vulnerabilities
  • Denial of service issues
  • Infrastructure vulnerabilities
  • Social media administrative control breaches

KYC required

The submission of KYC information is a requirement for payout processing.

Prohibited Activities

Default prohibited activities
  • Any testing on mainnet or public testnet deployed code; all testing should be done on local-forks of either public testnet or mainnet
  • Any testing with pricing oracles or third-party smart contracts
  • Attempting phishing or other social engineering attacks against our employees and/or customers
  • Any testing with third-party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks)
  • Any denial of service attacks that are executed against project assets
  • Automated testing of services that generates significant amounts of traffic
  • Public disclosure of an unpatched vulnerability in an embargoed bounty
  • Any other actions prohibited by the Immunefi Rules

Feasibility Limitations

The project may be receiving reports that are valid (the bug and attack vector are real) and cite assets and impacts that are in scope, but there may be obstacles or barriers to executing the attack in the real world. In other words, there is a question about how feasible the attack really is. Conversely, there may also be mitigation measures that projects can take to prevent the impact of the bug, which are not feasible or would require unconventional action and hence, should not be used as reasons for downgrading a bug's severity. Therefore, Immunefi has developed a set of feasibility limitation standards which by default states what security researchers, as well as projects, can or cannot cite when reviewing a bug report.