Europeum operates and scales Europe's sovereign digital trust infrastructure, enabling secure, transparent, and interoperable services across the public and private sectors.
The EBSI Trusted Schemas Registry (TSR) is an on-chain component of the European Blockchain Services Infrastructure that stores, versions, and serves JSON schema definitions and their associated metadata for the EBSI ecosystem. Deployed as an upgradeable Solidity contract on an EBSI EVM-compatible ledger, it maintains an append-only history of schema revisions keyed by SHA2-256 content hashes, while delegating all write authorization to an external policy registry.
| Target | Type | Severity |
|---|---|---|
https://gitlab.com/europeum/public/core-services Copy Final Commit: d1535bacb0ee03fc987339c58324b34c3db14687 | Smart Contract | Critical |
Final Commit: d1535bacb0ee03fc987339c58324b34c3db14687
We are looking for evidence and reasons for incorrect behavior of the smart contract, which could cause unintended functionality:
Clear wording:
Allocated bounty reward will be split between all researchers who submitted the same issue (where uniq issues receive 1/3 of the pool and researchers will get 1/9 each of the initial reward pool).
Full Reward: If a critical vulnerability is found by only one participant, that reporter receives 100% of the bounty pool.
If multiple participants find the same vulnerability, the allocated bounty for that issue (bounty pool always equally split among all unique issues reported) is divided equally among all reporters. Example: If two researchers report the same vulnerability, each receives 50% of the allocated bounty. It can be 50% of the bounty pool if only one eligible issue was reported.
Split Based on Uniqueness of issues reported:
Each will receive 50% of the bounty pool.
For any questions regarding the program, feel free to reach out in our DualDefense Support Request.
Do not discuss this program or any vulnerabilities (even resolved ones) outside of the program without express consent from the organization
We are happy to thank everyone who submits valid reports which help us improve our security. However, only those that meet the following eligibility requirements may receive a monetary reward:
Hacken - Jul 2026
contracts/schemas-registry/contracts/libraries
└── SchemaLib.sol
contracts/schemas-registry/contracts
└── SchemaRegistry.sol