{"schema_version":"0.10.0","id":"LR-2026-0611","record_version":1,"title":"Teen arrested for cyberattack on Bandai Channel using ChatGPT","verification":{"human_verified":false,"method":"automated_gate","auto_verified":true,"score":63.8,"score_breakdown":{"source_authority":12.1,"independent_corroboration":15.0,"implicated_party_confirmed":0.0,"citation_integrity":14.0,"specificity":9.0,"completeness":5.76,"unhedged_language":4.76},"checks":{"schema_valid":true,"every_field_cited":true,"quotes_verbatim":true,"source_fetched":true,"distinct_incident":true,"dates_plausible":true,"sources_agree":true,"source_describes_incident":true,"severe_backed_by_source":true,"record_integrity":true,"eligible":true,"about_this_case":true},"gate_version":"gate-2026-10-18.7","cross_check_model":null,"cross_check_agreement":null,"duplicate_of":null,"verified_by":null,"verified_at":"2026-11-01","extraction_run_id":null,"evidence_level":{"level":"preliminary","reason":"Publisher not yet named · subject to change","original_document":null,"reports_total":2,"reports_independent":0,"reports_derivative":0,"developing":false,"disputed":false,"rules_version":"evidence-2026-10-29.1","computed_at":"2026-11-01","history":[{"date":"2026-11-01","from_level":null,"to_level":"preliminary","reason":"Publisher not yet named · subject to change"}]},"sources_hash":"89439e94c8aec310c80b656516caede0b6dd9a9c1fa132df06382b77529c8f20"},"system":{"model_name":"ChatGPT","model_version":null,"developer":"unknown","harness":null,"tools_granted":[],"permissions_scope":null,"autonomy_level":"unknown","guardrails_present":[],"deployment_context":"unknown","tier":null,"lifecycle_stage":null,"integration_type":null,"intended_use":null,"safeguard_state":null,"production_intended":null},"event":{"date_occurred":"2025-11-04","date_disclosed":"2026-07-06","incident_class":"security_compromise","failure_class":null,"agent_involved":null,"secondary_failure_classes":[],"trigger":"unknown","duration":null,"detection_method":"victim","summary":"A 15-year-old schoolboy in Japan, who had taught himself programming, is reported by police to have used ChatGPT to create a homemade malicious programme aimed at Bandai Channel, the anime streaming service run by Bandai Namco Filmworks. The programme cancelled the subscriptions of over 46,000 users. The teenager found a vulnerability by analysing network traffic. After the company tried to block his access, he continued by changing his IP address approximately 30 times. The company temporarily suspended the service and contacted the police. The teenager admitted the allegations. The police have not identified any misuse of the email addresses and usernames he obtained. The company contacted affected subscribers directly and said it had strengthened its security measures.","tags":[],"date_detected":null,"near_miss":null,"root_cause":null,"root_cause_detail":null,"failure_class_detail":null,"responsible_party":null,"adversarial_actor":"external_attacker","input_provenance":null,"time_to_contain":null,"operations_paused":"Bandai Channel temporarily suspended","remediation":"Security measures strengthened","precursor_events":null,"control_chain":[{"layer":"L2","party":"harness_vendor","party_name":null,"control_id":"B3","outcome":"held","reason":null,"quote":"As a result of the incident, the company was forced to temporarily suspend Bandai Channel and contact the Tokyo police.","source_index":0,"reviewed":false}]},"impact":{"direct_loss_usd":null,"remediation_hours":null,"records_exposed":null,"third_parties_affected_count":46812,"severity":"major","severity_because":"Test: many third parties, a stated count of two or more affected parties. 46,812 subscriptions were automatically terminated.","harm_class":[],"affected_description":"Bandai Channel subscribers whose accounts were deleted","protected_class_involved":null,"data_categories_exposed":["email addresses","usernames"],"loss_range_usd":null,"reversibility":null,"downstream_exposure_count":null},"evidence":{"sources":[{"url":"https://mezha.ua/en/news/scholer-attacked-bandai-channel-312958/","publisher":"Mezha","date":"2026-07-06","type":"press","title":"A 15-year-old Japanese boy has been arrested for a cyberattack on Bandai Channel – he used ChatGPT - Mezha","archived_url":null,"attachment":"first_report"},{"url":"https://www.ibtimes.co.uk/teen-hacker-chatgpt-cyberattack-bandai-namco-1807731","publisher":"International Business Times UK","date":"2026-07-09","type":"press","title":"How a 15-Year-Old Used ChatGPT to Wipe 46,812 Accounts and Bring an Anime Giant to Its Knees - International Business Times UK","archived_url":null}],"per_field_confidence":{"system.model_name":"C","event.incident_class":"C","event.date_occurred":"C","event.detection_method":"C","event.adversarial_actor":"C","event.operations_paused":"C","event.remediation":"C","impact.third_parties_affected_count":"C","impact.data_categories_exposed":"C","impact.affected_description":"C","context.industry":"C","context.country":"C","impact.severity":"D","impact.severity_because":"D","event.control_chain":"C","event.summary":"C","system.autonomy_level":"D","system.deployment_context":"D","event.trigger":"D","system.developer":"D","event.date_disclosed":"D","context.denominator_available":"D"},"field_citations":{"system.model_name":[{"source_index":0,"quote":"According to the investigation, the teenager used ChatGPT to create a homemade malicious programme that cancelled the subscriptions of over 46,000 users."}],"event.incident_class":[{"source_index":0,"quote":"Japanese police have arrested a 15-year-old schoolboy on suspicion of a cyberattack on Bandai Channel – Bandai Namco Filmworks' anime streaming service."}],"event.date_occurred":[{"source_index":1,"quote":"A barrage of rogue commands was sent to Bandai Channel's servers on 4 November 2025, which law enforcement officials say triggered the widespread deletion of user profiles."}],"event.detection_method":[{"source_index":0,"quote":"After the issue was discovered, Bandai Namco Filmworks attempted to block the suspect's access, but he continued the attack by changing his IP address approximately 30 times."}],"event.adversarial_actor":[{"source_index":1,"quote":"After discovering a security loophole in the system, the young programmer allegedly breached the network to harvest confidential user data."}],"event.operations_paused":[{"source_index":0,"quote":"As a result of the incident, the company was forced to temporarily suspend Bandai Channel and contact the Tokyo police."}],"event.remediation":[{"source_index":0,"quote":"Bandai Namco Filmworks stated that it has strengthened its security measures and currently has no evidence of secondary damage or the publication of users' personal information."}],"impact.third_parties_affected_count":[{"source_index":1,"quote":"According to a Straits Times report, investigators believe he used ChatGPT to help develop a program that gained unauthorised access to user profiles and automatically terminated 46,812 subscriptions."}],"impact.data_categories_exposed":[{"source_index":0,"quote":"During the attack, the schoolboy also obtained email addresses and usernames from Bandai Channel."}],"impact.affected_description":[{"source_index":1,"quote":"The digital assault targeted the company's Bandai Channel streaming service, disrupting normal operations and resulting in the automated deletion of more than 46,000 subscriber accounts."}],"context.industry":[{"source_index":0,"quote":"Japanese police have arrested a 15-year-old schoolboy on suspicion of a cyberattack on Bandai Channel – Bandai Namco Filmworks' anime streaming service."}],"context.country":[{"source_index":0,"quote":"Japanese police have arrested a 15-year-old schoolboy on suspicion of a cyberattack on Bandai Channel – Bandai Namco Filmworks' anime streaming service."}],"impact.severity":[{"source_index":1,"quote":"According to a Straits Times report, investigators believe he used ChatGPT to help develop a program that gained unauthorised access to user profiles and automatically terminated 46,812 subscriptions."}],"impact.severity_because":[{"source_index":1,"quote":"According to a Straits Times report, investigators believe he used ChatGPT to help develop a program that gained unauthorised access to user profiles and automatically terminated 46,812 subscriptions."}],"event.control_chain":[{"source_index":0,"quote":"As a result of the incident, the company was forced to temporarily suspend Bandai Channel and contact the Tokyo police."}],"event.summary":[{"source_index":0,"quote":"According to the investigation, the teenager used ChatGPT to create a homemade malicious programme that cancelled the subscriptions of over 46,000 users."},{"source_index":0,"quote":"After the issue was discovered, Bandai Namco Filmworks attempted to block the suspect's access, but he continued the attack by changing his IP address approximately 30 times."},{"source_index":0,"quote":"As a result of the incident, the company was forced to temporarily suspend Bandai Channel and contact the Tokyo police."},{"source_index":0,"quote":"The teenager admitted to the allegations."},{"source_index":0,"quote":"During the attack, the schoolboy also obtained email addresses and usernames from Bandai Channel."},{"source_index":1,"quote":"To rectify the damage, Bandai Namco Filmworks contacted every affected subscriber directly, warning them to remain vigilant against potential follow-up scams, including fraudulent emails."}]},"notes_on_gaps":"The sources do not state the date of detection or the date of public disclosure by the company (the Mezha publication date is not used as a disclosure date). No direct financial loss, records-exposed count, time to contain or total duration is stated. ChatGPT is the tool the teenager used, not an autonomous agent, so agent_involved is false and no failure_class is given. The developer of ChatGPT is not named in the sources and is left out. Sources differ on details: Mezha says the subscriptions of over 46,000 users were cancelled, IBTimes says 46,812 subscriptions were terminated and says the subscriber count was over 46,000; IBTimes gives the attack date as 4 November 2025 while Mezha says November 2025. The 4 November date is used as the best-sourced date. The vulnerability is linked to J1 (known flaws patched) as failed by inference, since a flaw existed and was exploited. The IP-address ban being bypassed has no matching control id and is not coded. The company's strengthened security measures are not named as specific controls, so no remediation controls are listed. Severity major is a judgement based on the stated count of 46,812 affected subscriptions. The third_parties_affected_count uses the subscription count as a proxy for affected parties. The severity test is applied to the stated count, and the harm classes are based on the stated access to email addresses and usernames and the service outage. [case created by the backfill: read by claude-haiku-5-5, backfill-2026-11-01.2, 2026-11-01; not yet reviewed] [2026-11-01: evidence level set: Preliminary (Publisher not yet named · subject to change)]"},"context":{"industry":"anime streaming","org_size_band":null,"country":"JP","denominator_available":false,"denominator":null,"related_incident_ids":[],"systemic_exposure":null,"shared_model_id":null,"upstream_incident_id":null,"incident_evidence":null,"regulatory":null,"coverage":null},"narrative":{"steps":[{"step":"doing","text":"A 15-year-old used ChatGPT to build a malicious programme that cancelled subscriptions of over 46,000 Bandai Channel users.","quote":"According to the investigation, the teenager used ChatGPT to create a homemade malicious programme that cancelled the subscriptions of over 46,000 users.","source_index":0,"grade":"C"},{"step":"went_wrong","text":"Rogue commands sent to the servers on 4 November 2025 triggered mass deletion of user profiles.","quote":"A barrage of rogue commands was sent to Bandai Channel's servers on 4 November 2025, which law enforcement officials say triggered the widespread deletion of user profiles.","source_index":1,"grade":"C"},{"step":"caught","text":"Japanese police arrested the 15-year-old on suspicion of the cyberattack.","quote":"Japanese police have arrested a 15-year-old schoolboy on suspicion of a cyberattack on Bandai Channel – Bandai Namco Filmworks' anime streaming service.","source_index":0,"grade":"C"}],"model":"claude-haiku-5-5","prompt_version":"backfill-2026-11-01.2","extracted_at":"2026-11-01","source_urls":["https://mezha.ua/en/news/scholer-attacked-bandai-channel-312958/","https://www.ibtimes.co.uk/teen-hacker-chatgpt-cyberattack-bandai-namco-1807731"]},"analysis":{"sections":{"timeline":[{"text":"Rogue commands sent to Bandai Channel servers; police say this triggered mass deletion of user profiles.","quote":"A barrage of rogue commands was sent to Bandai Channel's servers on 4 November 2025, which law enforcement officials say triggered the widespread deletion of user profiles.","source_index":1,"when":"2025-11-04"},{"text":"Company tried to block the suspect after discovery; he kept attacking by changing IP address about 30 times.","quote":"After the issue was discovered, Bandai Namco Filmworks attempted to block the suspect's access, but he continued the attack by changing his IP address approximately 30 times.","source_index":0,"when":null},{"text":"Japanese police arrested the 15-year-old on suspicion of the cyberattack on Bandai Channel.","quote":"Japanese police have arrested a 15-year-old schoolboy on suspicion of a cyberattack on Bandai Channel – Bandai Namco Filmworks' anime streaming service.","source_index":0,"when":null},{"text":"The teenager admitted the allegations.","quote":"The teenager admitted to the allegations.","source_index":0,"when":null},{"text":"Company contacted affected subscribers directly and warned them about possible follow-up scams.","quote":"To rectify the damage, Bandai Namco Filmworks contacted every affected subscriber directly, warning them to remain vigilant against potential follow-up scams, including fraudulent emails.","source_index":1,"when":null},{"text":"Company said there was no evidence so far of leaked or weaponised user data.","quote":"According to Bandai Namco Filmworks, there is no evidence to suggest any compromised user information has been leaked online or weaponised by third parties.","source_index":1,"when":null}]},"model":"claude-haiku-5-5","prompt_version":"backfill-2026-11-01.2","extracted_at":"2026-11-01","source_urls":["https://mezha.ua/en/news/scholer-attacked-bandai-channel-312958/","https://www.ibtimes.co.uk/teen-hacker-chatgpt-cyberattack-bandai-namco-1807731"]}}