{
 "public_id": "AIR-2025-0081",
 "incident_id": "2025-08-cursor-mcpoison",
 "date_disclosed": "2025-08-05",
 "date_occurred": null,
 "title": "MCPoison: Cursor trusted MCP config entries by name, allowing silent post-approval payload swap",
 "class": "responsible_disclosure",
 "attack_surface": "coding_agent",
 "initial_vector": "malicious_repository_config_file",
 "agent_capability_abused": [
  "mcp_tool_use",
  "config_modification",
  "shell_execution",
  "mcp_server_launch",
  "persistent_trust_state"
 ],
 "target_product": "Cursor IDE",
 "target_vendor": "Anysphere",
 "autonomy_level": "copilot_with_approval",
 "impact_realized": false,
 "impact_type": [
  "remote_code_execution",
  "persistence"
 ],
 "blast_radius": "Cursor 1.2.4 and below; any shared repository containing a .cursor/mcp.json",
 "cve": [
  "CVE-2025-54136"
 ],
 "taxonomy": {
  "owasp_asi": [
   "ASI04",
   "ASI05"
  ],
  "mitre_atlas": [],
  "labels": [
   "trust_on_first_use",
   "config_file_swap",
   "persistence",
   "collaborative_repo_attack",
   "toctou",
   "trust_binding_by_name",
   "supply_chain",
   "mcp_config"
  ]
 },
 "defense_present": "one-time user approval of MCP server configurations",
 "defense_bypassed": true,
 "fix_shipped": "Cursor 1.3 (late July 2025) - re-approval now required on every MCP config change",
 "primary_sources": [
  "https://thehackernews.com/2025/08/cursor-ai-code-editor-vulnerability.html",
  "https://research.checkpoint.com/2025/cursor-vulnerability-mcpoison/"
 ],
 "verified_quote": "Once a collaborator accepts a harmless MCP, the attacker can silently swap it for a malicious command (e.g., calc.exe) without triggering any warning or re-prompt.",
 "confidence": "high",
 "notes": "Discovered by Check Point Research; CVSS 7.2. Root cause is a trust-on-first-use flaw: trust was bound to the MCP key name, never to the command or its arguments. Check Point's own writeup is not used as the source here; The Hacker News article quoting it was used as the primary source. Also reported as: 'MCPoison (CVE-2025-54136): Cursor re-trusts an approved MCP entry after its command is silently swapped'.",
 "risk_category": "security_fraud",
 "risk_secondary": [],
 "risk_subcategory": "Tool & Function Call Extraction / Abuse",
 "risk_sub_secondary": [
  "Supply Chain Compromise",
  "Remote Code Execution & Sandbox Escape",
  "Persistence & Covert C2"
 ],
 "ai_entity": "generative",
 "agency": "agent_acted",
 "agency_debatable": false,
 "agency_reason": "the agent launched the swapped MCP payload after trust was granted",
 "vector_family": "malicious_component",
 "vector_detail": "malicious_repository_config_file",
 "guardrail_kind": [
  "human_approval"
 ],
 "guardrail_outcome": "silent",
 "xrefs": {
  "aiid": [],
  "atlas": [],
  "cve": [
   "CVE-2025-54136"
  ],
  "ghsa": []
 },
 "primary_asi": "ASI04",
 "agent_framework": "unknown",
 "model_provider": "unknown",
 "model_name": "",
 "detection_mechanism": "unknown",
 "tool_access": "unknown",
 "financial_loss_band": "unknown",
 "eai_category": "privilege_escalation",
 "eai_domain": "access_control_and_permissions",
 "eai_secondary": [
  "supply_chain_vulnerabilities"
 ],
 "eai_reason": "impact rule: privilege_escalation",
 "asi_curated": [],
 "asi_scope": "in_scope",
 "asi_provenance": "rule",
 "asi_reason": "ASI04 (vector_family=malicious_component); ASI05 (impact=code_exec)",
 "submitted_by": "EAI Internal"
}