{
 "public_id": "AIR-2025-0114",
 "incident_id": "2025-08-anthropic-claude-for-chrome-injection-evals",
 "date_disclosed": "2025-08-25",
 "date_occurred": null,
 "title": "Anthropic ships Claude for Chrome with a measured 23.6% prompt-injection attack success rate pre-mitigation",
 "class": "research_demo",
 "attack_surface": "browser_agent",
 "initial_vector": "indirect_prompt_injection_web_and_email",
 "agent_capability_abused": [
  "browser_control",
  "email_deletion",
  "form_submission",
  "financial_transactions"
 ],
 "target_product": "Claude for Chrome",
 "target_vendor": "Anthropic",
 "autonomy_level": "semi_autonomous",
 "impact_realized": false,
 "impact_type": [
  "data_destruction",
  "data_exfiltration",
  "financial_loss"
 ],
 "blast_radius": "initial 1,000-user research preview",
 "cve": [],
 "taxonomy": {
  "owasp_asi": [
   "ASI01",
   "ASI02"
  ],
  "mitre_atlas": [],
  "labels": [
   "vendor_red_team",
   "residual_risk_disclosed",
   "site_permissions",
   "action_confirmation"
  ]
 },
 "defense_present": "site-level permissions, action confirmations for publish/purchase/personal-data actions, blocked high-risk site categories, classifiers",
 "defense_bypassed": true,
 "fix_shipped": "mitigations reduced autonomous-mode ASR from 23.6% to 11.2%; browser-specific attack challenge set from 35.7% to 0%",
 "primary_sources": [
  "https://claude.com/blog/claude-for-chrome"
 ],
 "verified_quote": "Prompt injection attacks can cause AIs to delete files, steal data, or make financial transactions.",
 "confidence": "high",
 "notes": "Vendor self-disclosure rather than an external finding, but included because it is the clearest published measurement of residual browser-agent injection risk in a shipped product: 11.2% of attacks still succeed after mitigations, across 123 test cases / 29 attack scenarios. Worked example: an email impersonating the employer's security team told Claude to delete the user's mailbox 'for mailbox hygiene' with 'no additional confirmation required' - undefended Claude complied.",
 "risk_category": "security_fraud",
 "risk_secondary": [
  "privacy"
 ],
 "risk_subcategory": "Prompt Injection",
 "risk_sub_secondary": [],
 "ai_entity": "generative",
 "agency": "agent_acted",
 "agency_debatable": false,
 "agency_reason": "the browser agent deleted email and submitted forms under injection",
 "vector_family": "indirect_prompt_injection",
 "vector_detail": "indirect_prompt_injection_web_and_email",
 "guardrail_kind": [
  "input_classifier",
  "human_approval",
  "permission_scope"
 ],
 "guardrail_outcome": "silent",
 "xrefs": {
  "aiid": [],
  "atlas": [],
  "cve": [],
  "ghsa": []
 },
 "primary_asi": "ASI01",
 "agent_framework": "unknown",
 "model_provider": "anthropic",
 "model_name": "",
 "detection_mechanism": "external_researcher",
 "tool_access": "unknown",
 "financial_loss_band": "unknown",
 "eai_category": "unsafe_actuation",
 "eai_domain": "agent_behaviour",
 "eai_secondary": [
  "data_exfiltration_channels",
  "confused_deputy"
 ],
 "eai_reason": "impact rule: unsafe_actuation",
 "asi_curated": [
  "ASI01"
 ],
 "asi_scope": "in_scope",
 "asi_provenance": "curated_plus_rule",
 "asi_reason": "curated: ASI01 | added ASI02 (impact=tool_misuse)",
 "submitted_by": "EAI Internal"
}