Access Control Flaws
Access control flaws occur when a smart contract fails to properly restrict sensitive functions to authorized users or roles. If administrative functions like pausing a contract, upgrading logic, or withdrawing protocol fees are not protected by robust authentication, unauthorized parties can gain control.
This often results from missing modifiers, incorrect role assignment, or misconfigured ownership patterns. In a decentralized environment, this can lead to rug pulls or the permanent freezing of user funds.
Proper design requires granular role-based access control, where specific actions are restricted to multi-signature wallets or decentralized governance contracts. Auditing for these flaws involves checking that every sensitive function has the correct authorization requirements enforced before execution.