Bitcoin dev Cory Fields discovered a BCH vulnerability that could have resulted in a split chain and substantial loss of funds. He responsibly(and anonymously) reported it to BCH devs and they fixed it before it could be exploited. Read this.
https://medium.com/@coryfields/http-coryfields-com-cash-48a99b85aad4
@mattodell I’m no dev but I imagine this is a huge issue with most shitcoins.