Burst water mains. Evacuated hospitals. In a closed-door simulation, insurers played out their response to a mass disruption by China’s Volt Typhoon hackers—and found a nightmare scenario.

A researcher found that using Anthropic’s Claude Opus 4.7, he could break into the website of Front Gate—used by every festival from Lollapalooza to Bonnaroo—and freely issue any ticket he chose.