The Cryptocurrency project Datamine ($DAM) implements a contract largely built with OpenZeppelin functions. The Datamine project offered a bug bounty of $5,000 for “anyone who is able to identify a major exploit/security vulnerability disclosure involving our smart contracts, namely the ability to gain extra FLUX rewards or withdraw DAM tokens that do not belong to their account”.
A “security researcher” of some nebulous repute allegedly identified a major vulnerability within the Datamine implementation of OpenZeppelin’s smart contract platform, notably that their implementation is open to a Frontrunning vulnerability.
The DAM smart contract is located here on Github: https://github.com/Datamine-Crypto/white-paper/blob/master/contracts/dam.sol
Notable area that was highlighted as problematic is beginning at line 960.