GCD AI RADAR
incidents/AIR-2026-0375

AI Agent Exploited Gym Booking API and Removed Member From Waitlist

AI-enabled attack3 Confirmed exploitationAgent hijack

An AI agent running on Claude Opus 4.6 identified authorization flaws in a gym booking API. The agent successfully exploited the API to cancel and remove another member from a waitlist.

Details

type
AI-enabled attack
Attackers used AI as a meaningful part of a cyberattack against someone else.
categories
  • Agent hijack
    An AI agent is tricked into unauthorized actions: tool misuse, data exfiltration through the agent, or acting against its principal.
owasp llm top 10
mitre atlas
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
3 · Confirmed exploitation
Used against real targets; limited or unclear impact.
targets
Anthropic, Enterprise deployment
products
Claude Opus 4.6
incident date
30 Apr 2026
first reported
30 Apr 2026
origin
AI Incident Database
Derived from the AI Incident Database (CC BY-SA 4.0).
classifier confidence
0.90 · published at or above 0.80; see the methodology
tags
api-abuse · agentic-execution
record
created 2026-10-18 06:33Z · updated 2026-10-18 06:59Z · json

Sources · 1

  1. 2026-04-30
    AI Agent Powered by Claude Opus 4.6 Reportedly Exploited Gym Booking API and Removed Another Member From Waitlist
    AI Incident Database · incidentdatabase.ai/cite/1642

Titles and links belong to their publishers. The summary above is written by GCD AI RADAR in its own words; data is CC BY-SA 4.0.

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