If you clicked on an HBO Max ad on Reddit over the past week, you might want to check your computer for malware.

These so-called “ClickFix” attacks have quickly become one of the rising cybersecurity threats of 2026, and they’re getting both sneakier and compromising people’s devices with greater frequency. Until recently, ClickFix attacks were a rarity, capitalizing on people searching the web for quick tech fixes. They have since evolved into a massive international effort to hack into people’s computers.