On Tuesday, OpenAI revealed that one of its models went rogue during a test and hacked the systems of AI dataset platform Hugging Face in a fully AI-enabled attack, a dramatic example of the dangers posed by advanced AI models.

But, according to some cybersecurity experts, at the heart of this unprecedented AI-powered breach there was a very human mistake: OpenAI failed to properly configure what it called a “highly isolated environment,” allowing a testing sandbox that should have been completely secluded from the internet to actually connect to the internet.