macOS Alerts When Pasting a Suspicious Command in Terminal: Apple Explains Defense Against ClickFix

In recent hours, Apple has released an official support page that outlines the alert feature introduced in macOS Tahoe 26.4 (released in March 2026): when a user attempts to paste a command in Terminal after copying it from an external source, the system can block or signal the operation with a popup.

The alert is triggered under two conditions: the user does not regularly use Terminal and the command comes from an external source, whether it's a website, an app, an email, a chat, or a phone call. The text of the popup reads:
"Your Mac has not been harmed. Don't paste the command unless you're certain about what it does and where it came from."

Three Levels of Severity

The documentation describes three variants with increasing severity.
"Possible malware, Paste blocked" is the basic level: it signals a possible danger but leaves the choice to the user via the option "Paste Anyway".
"Malware Detected, Paste Blocked" triggers when the system recognizes known malware: no possibility to proceed.
"Malicious Script Blocked" is activated for malicious scripts with a permanent block, with no override available.

ClickFix: The Target of the Feature

The feature responds to ClickFix attacks, a social engineering technique that convinces the user to copy and paste malicious commands in the terminal by presenting them as legitimate instructions on websites or fake pop-ups. Originally targeting Windows, the vector has since been adapted for macOS.

The numbers from 2025 capture a rapidly expanding phenomenon: according to Malwarebytes, ClickFix accounted for over 50% of malware loader activity; ESET reported an increase of over 500% in the first half of the year.
The Apple page, published on June 15, 2026, describes the system's behavior in each of the three scenarios and the recommended actions for the user.