All software has flaws, no matter how carefully you vet it. So the question isn't how to write perfect code, but how to respond to mistakes as you find them. And while Apple has earned a strong reputation for security, a string of significant vulnerabilities in macOS and iOS have strained Apple's safety net—and led some security researchers and developers to question whether the issues are systemic. Take the release of Apple's macOS High Sierra operating system at the end of September.

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