Submission Details
Impact:
Likelihood:
[I-1] Missing indexed Parameters in Events Prevents Efficient Off-Chain Filtering
[I-1] Missing indexed Parameters in Events Prevents Efficient Off-Chain FilteringDescription
Events lack indexed parameters, making it difficult and expensive for off-chain applications to filter and query specific events. Indexed parameters create topics that allow efficient event filtering.
```solidity
// briVault.sol
event joinedEvent(address user, uint256 countryId);
event WinnerSet(string winner);
event Withdraw(address user, uint256 amount);
event CountriesSet(string[48] countries);
```
Risk
Likelihood:
High — omitting
indexedon event parameters is a common oversight and will frequently occur in real code.
Impact:
- Off-chain services cannot efficiently filter events by user address
- Increased query costs for front-ends and indexers
Proof of Concept
Recommended Mitigation
- remove this code
+ add this code
```diff
- event joinedEvent(address user, uint256 countryId);
- event WinnerSet(string winner);
- event Withdraw(address user, uint256 amount);
- event CountriesSet(string[48] countries);
+ event joinedEvent(address indexed user, uint256 indexed countryId);
+ event WinnerSet(string winner);
+ event Withdraw(address indexed user, uint256 amount);
+ event CountriesSet(string[48] countries);
```
Rewards breakdown
nSLOC
193This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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