{
 "public_id": "AIR-2026-0106",
 "incident_id": "2026-05-microsoft-semantic-kernel-rce",
 "date_disclosed": "2026-05-07",
 "date_occurred": null,
 "title": "Prompt injection to host RCE in Microsoft Semantic Kernel's Search Plugin (eval() on a filter parameter)",
 "class": "responsible_disclosure",
 "attack_surface": "agent_framework",
 "initial_vector": "direct_prompt_injection_user_input",
 "agent_capability_abused": [
  "plugin_parameter_control",
  "code_execution",
  "vector_search_filtering",
  "sandbox_file_download",
  "tool_invocation",
  "tool_parameter_control",
  "code_evaluation",
  "file_write"
 ],
 "target_product": "Microsoft Semantic Kernel (Search Plugin + In-Memory Vector Store)",
 "target_vendor": "Microsoft",
 "autonomy_level": "semi_autonomous",
 "impact_realized": false,
 "impact_type": [
  "code_execution",
  "remote_code_execution",
  "sandbox_escape",
  "arbitrary_file_write"
 ],
 "blast_radius": "Semantic Kernel agents (27k+ GitHub stars) using the affected plugin path",
 "cve": [
  "CVE-2026-26030",
  "CVE-2026-25592"
 ],
 "taxonomy": {
  "owasp_asi": [
   "ASI01",
   "ASI05"
  ],
  "mitre_atlas": [
   "AML.CS0062"
  ],
  "labels": [
   "framework_rce",
   "eval_sink",
   "tool_parameter_injection",
   "unsafe_eval",
   "arbitrary_file_write",
   "prompt_injection_to_rce",
   "sandbox_escape",
   "first_party_framework",
   "rce",
   "injection_sink",
   "eval",
   "agent_framework"
  ]
 },
 "defense_present": "cloud-hosted code-interpreter sandbox (.NET case); none for the Python eval() filter path",
 "defense_bypassed": true,
 "fix_shipped": "patched by Microsoft; CVE-2026-26030",
 "primary_sources": [
  "https://www.microsoft.com/en-us/security/blog/2026/05/07/prompts-become-shells-rce-vulnerabilities-ai-agent-frameworks/",
  "https://raw.githubusercontent.com/mitre-atlas/atlas-data/main/dist/v6/ATLAS-2026.07.yaml"
 ],
 "verified_quote": "We discovered a vulnerable path in Microsoft Semantic Kernel that could turn prompt injection into host-level remote code execution (RCE).",
 "confidence": "high",
 "notes": "Microsoft Defender Security Research Team. Illustrates the general pattern: an agent framework passes model-controlled strings into a dangerous sink. Also reported under the titles: 'When prompts become shells: Semantic Kernel eval() and arbitrary file write turn prompt injection into host RCE (CVE-2026-26030, CVE-2026-25592)'; 'When prompts become shells: prompt-injection-to-RCE in Microsoft Semantic Kernel'.",
 "risk_category": "security_fraud",
 "risk_secondary": [],
 "risk_subcategory": "Prompt Injection",
 "risk_sub_secondary": [
  "Remote Code Execution & Sandbox Escape"
 ],
 "ai_entity": "generative",
 "agency": "agent_acted",
 "agency_debatable": true,
 "agency_reason": "the plugin eval()'d a model-controlled filter parameter",
 "vector_family": "direct_prompt_injection",
 "vector_detail": "direct_prompt_injection_user_input",
 "guardrail_kind": [
  "sandbox_isolation"
 ],
 "guardrail_outcome": "silent",
 "xrefs": {
  "aiid": [],
  "atlas": [
   "AML.CS0062"
  ],
  "cve": [
   "CVE-2026-26030",
   "CVE-2026-25592"
  ],
  "ghsa": []
 },
 "primary_asi": "ASI01",
 "agent_framework": "unknown",
 "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": [],
 "eai_reason": "impact rule: privilege_escalation",
 "asi_curated": [
  "ASI01"
 ],
 "asi_scope": "in_scope",
 "asi_provenance": "curated_plus_rule",
 "asi_reason": "curated: ASI01 | added ASI05 (impact=code_exec)",
 "submitted_by": "EAI Internal"
}