Validation Bypass: Refund requests from events were processed without validating origin/destination chain IDs, fill block range, matching fill/deposit, or token validity, allowing invalid requests to cause financial discrepancies.

Validation Bypass: Multicall bundles did not enforce that all transactions target the same contract and chain, enabling potential misrouting or incorrect execution of batched operations.

Improper Access Control: Deposits could be executed against arbitrary periphery addresses nominated by messages, lacking an allowlist, allowing unauthorized or malicious target execution.