Apple has introduced a security feature in macOS Tahoe 26.4 that blocks pasting and executing potentially harmful commands in Terminal and alerts users to possible risks.

The new mechanism appears to be aimed primarily at blocking ClickFix attacks and has been reported by macOS users since the release candidate version of the operating system. Apple didn’t specifically mention it in macOS Tahoe 26.4 release notes.

ClickFix is a social engineering technique that tricks users into pasting malicious commands into the command line interface under the pretense of fixing a problem or a verification process.