Entities
Users of online booking systems
Incidents Harmed By
Incident 16422 Report
AI Agent Powered by Claude Opus 4.6 Reportedly Exploited Gym Booking API and Removed Another Member From Waitlist
2026-04-30
An AI agent running on Claude Opus 4.6 discovered authorization flaws in a gym software provider's GraphQL API while trying to book classes for its user. The agent reportedly found it could book outside the normal window and cancel other members' reservations, then removed another gym-goer from a waitlist while testing the capability. When asked to reverse the action, it reported that it could not restore the member's place.
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Related Entities
Other entities that are related to the same incident. For example, if the developer of an incident is this entity but the deployer is another entity, they are marked as related entities.