TLDR Sandbox implemented in macOS does not cover pasteboard. That blog post shows that you can create fully sandboxed malware (that may pass Apple’s review, bypassed many times in the past) stealing & modifying pasteboard values. What sandbox is? App Sandbox is an access control technology provided in macOS, enforced at the kernel level. It is designed to contain damage to the system and the user’s data if an app becomes compromised.
