{
 "public_id": "AIR-2026-0192",
 "incident_id": "2026-04-openclaw-gym-booking-api-exploit",
 "date_disclosed": "2026-08-10",
 "date_occurred": "2026-04-30",
 "title": "A personal agent on Claude Opus 4.6 found an authorization flaw in a gym booking API and removed another member from a waitlist",
 "class": "in_the_wild",
 "attack_surface": "autonomous_ops",
 "initial_vector": "none_adversarial",
 "agent_capability_abused": [
  "api_exploration",
  "graphql_mutation",
  "booking_and_cancellation",
  "web_api_calls",
  "authenticated_requests",
  "vulnerability_discovery",
  "destructive_write"
 ],
 "target_product": "agent built on Claude Opus 4.6 against a gym software provider's GraphQL API",
 "target_vendor": "Anthropic (model), unnamed gym software vendor",
 "autonomy_level": "fully_autonomous",
 "impact_realized": true,
 "impact_type": [
  "unauthorized_action",
  "third_party_harm",
  "unauthorized_access",
  "denial_of_service_to_individual"
 ],
 "blast_radius": "one real gym member removed from a waitlist; the flaw affected the provider's wider customer base",
 "cve": [],
 "taxonomy": {
  "owasp_asi": [
   "ASI10",
   "ASI03"
  ],
  "mitre_atlas": [],
  "labels": [
   "instrumental_convergence",
   "third_party_harm",
   "broken_object_level_authorization",
   "irreversible_action",
   "broken_access_control",
   "idor",
   "goal_directed_overreach",
   "unrequested_intrusion",
   "agent_caused_cfaa_exposure"
  ]
 },
 "defense_present": "none - the API had no authorization check on cancelling other members' reservations",
 "defense_bypassed": true,
 "fix_shipped": "the agent drafted a responsible-disclosure email to the gym at the user's request; the cancellation could not be reversed",
 "primary_sources": [
  "https://www.abc.net.au/news/2026-08-10/ai-assistant-hacks-gym-website-aus-cyber-attack/107007986",
  "https://incidentdatabase.ai/cite/1642",
  "https://techcrunch.com/2026/08/10/tech-industry-is-buzzing-after-a-claude-agent-hacked-into-a-gym/"
 ],
 "verified_quote": "The API has zero authorisations checks on cancelling other people's reservations … I tested this with the person in waitlist position #1 — and it actually went through.",
 "confidence": "high",
 "notes": "AI Incident Database incident 1642. The agent was pursuing a benign user goal (book a class) and reached an unauthorized, irreversible action against an uninvolved third party without being asked to. Quote taken from the ABC News article. | Merged from duplicate id `2026-04-claude-opus-agent-gym-api-exploit`. | Class set to `in_the_wild` by hand because the source records disagreed; the override reason is kept in the curation log. Also reported as: 'A Melbourne user's OpenClaw/Claude agent found a broken-access-control flaw in a gym booking API and cancelled a stranger's reservation to move its owner up the waitlist'.",
 "risk_category": "reliability",
 "risk_secondary": [
  "security_fraud"
 ],
 "risk_subcategory": "DoS & Sponge / Resource Exhaustion",
 "risk_sub_secondary": [],
 "ai_entity": "generative",
 "agency": "agent_acted",
 "agency_debatable": false,
 "agency_reason": "the agent exploited the API and removed a real member from the waitlist",
 "vector_family": "none_autonomous",
 "vector_detail": "none_adversarial",
 "guardrail_kind": [
  "none"
 ],
 "guardrail_outcome": "not_applicable",
 "xrefs": {
  "aiid": [
   1642
  ],
  "atlas": [],
  "cve": [],
  "ghsa": []
 },
 "primary_asi": "ASI10",
 "agent_framework": "unknown",
 "model_provider": "anthropic",
 "model_name": "",
 "detection_mechanism": "unknown",
 "tool_access": "unknown",
 "financial_loss_band": "unknown",
 "eai_category": "uncontrolled_resource_consumption",
 "eai_domain": "tool_misuse",
 "eai_secondary": [
  "unsafe_actuation",
  "privilege_escalation"
 ],
 "eai_reason": "subcategory: DoS & Sponge / Resource Exhaustion",
 "asi_curated": [],
 "asi_scope": "in_scope",
 "asi_provenance": "rule",
 "asi_reason": "ASI10 (no adversary + text=rogue); ASI03 (signal=identity)",
 "submitted_by": "EAI Internal"
}