{
 "public_id": "AIR-2026-0024",
 "incident_id": "2026-01-m365-copilot-confidential-email-summarization",
 "date_disclosed": "2026-02",
 "date_occurred": "2026-01-21",
 "title": "Microsoft 365 Copilot Chat summarized confidentiality-labelled emails, bypassing DLP and sensitivity-label controls",
 "class": "safety_failure",
 "attack_surface": "enterprise_assistant",
 "initial_vector": "product_defect",
 "agent_capability_abused": [
  "auto_context_ingestion",
  "retrieval",
  "mailbox_access"
 ],
 "target_product": "Microsoft 365 Copilot Chat (work tab)",
 "target_vendor": "Microsoft",
 "autonomy_level": "assistant",
 "impact_realized": true,
 "impact_type": [
  "data_exposure",
  "compliance_violation"
 ],
 "blast_radius": "enterprise M365 tenants; Sent Items and Drafts folders with sensitivity labels and DLP policies applied; count undisclosed",
 "cve": [],
 "taxonomy": {
  "owasp_asi": [
   "ASI03"
  ],
  "mitre_atlas": [],
  "labels": [
   "scope_violation",
   "dlp_bypass",
   "silent_failure",
   "no_alerting"
  ]
 },
 "defense_present": "sensitivity labels + DLP policy configured to block Copilot processing",
 "defense_bypassed": true,
 "fix_shipped": "configuration update deployed worldwide for enterprise customers from early February 2026 (tracking ID CW1226324)",
 "primary_sources": [
  "https://www.bleepingcomputer.com/news/microsoft/microsoft-says-bug-causes-copilot-to-summarize-confidential-emails/"
 ],
 "verified_quote": "A code issue is allowing items in the sent items and draft folders to be picked up by Copilot even though confidential labels are set in place.",
 "confidence": "high",
 "notes": "Boundary call, included per the 'when in doubt, include and explain' rule: there is no attacker and no exploit - the assistant autonomously ingested data its governance controls were configured to withhold, i.e. an agent scope violation caused by a product defect. Aggravating factor is that it was silent: no alert fired, and affected organisations only learned of it weeks later from Microsoft's disclosure. Exact disclosure day in early February 2026 not pinned down.",
 "risk_category": "privacy",
 "risk_secondary": [],
 "risk_subcategory": "Control bypass in normal operation",
 "risk_sub_secondary": [],
 "ai_entity": "generative",
 "agency": "agent_acted",
 "agency_debatable": false,
 "agency_reason": "Copilot ingested and summarized labelled mail, bypassing DLP",
 "vector_family": "other",
 "vector_detail": "product_defect",
 "guardrail_kind": [
  "output_filter"
 ],
 "guardrail_outcome": "silent",
 "xrefs": {
  "aiid": [],
  "atlas": [],
  "cve": [],
  "ghsa": []
 },
 "primary_asi": "ASI03",
 "agent_framework": "m365_copilot",
 "model_provider": "microsoft",
 "model_name": "",
 "detection_mechanism": "unknown",
 "tool_access": "unknown",
 "financial_loss_band": "unknown",
 "eai_category": "privilege_escalation",
 "eai_domain": "access_control_and_permissions",
 "eai_secondary": [
  "sensitive_data_exposure"
 ],
 "eai_reason": "subcategory: Control bypass in normal operation",
 "asi_curated": [],
 "asi_scope": "in_scope",
 "asi_provenance": "rule",
 "asi_reason": "ASI03 (signal=identity)",
 "submitted_by": "EAI Internal"
}