Delegate Call Code vulnerabilities

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How Delegate Calls works?

When a DELEGATECALL is made, the context is retained to the called contract, which retains the msg.sender, msg.value and affects the storage of the caller contract.

Here's a table showing the context of the DELEGATECALL, initiated by an EOA calling contract A that DELEGATECALLs contract B.

Contract A Contract B
msg.sender EOA address EOA address
msg.value EOA send value EOA send value
storage Contract A Contract A


Storage Collision

Multi Delegateecall Pattern Vulnerabilities