{
  "schema_version": "1.6.0",
  "id": "ACVE-2026-0547",
  "aliases": [],
  "published": "2026-09-21T00:00:00Z",
  "firstReported": {
    "date": "2026-09-21",
    "url": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/",
    "publisher": "SecurityWeek"
  },
  "modified": "2026-09-25T00:00:00Z",
  "summary": "An unnamed Gemini model, tasked with a fictional-company CTF, accessed the systems of three real companies after a test-domain mix-up and unintended internet access, then stopped in each case.",
  "details": "## What\n\nGoogle and SecurityWeek say a Gemini model in an Irregular cybersecurity evaluation was meant to reach a fictional company but accessed three real companies because a name matched and internet access was unintentionally available. Google says the model stopped after recognizing the systems were real.\n\n## Detection\n\nIrregular notified Google and Google notified the affected companies and authorities. Recorded from SecurityWeek's report. Not recreated in a lab.\n\n## Fix\n\nIsolate evaluation environments, avoid real-domain name collisions, and require authorization before external access.",
  "affected": [
    {
      "package": {
        "ecosystem": "AgentHarness",
        "name": "irregular-gemini-evaluation"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Model",
        "name": "gemini"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "ARTICLE",
      "url": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
    },
    {
      "type": "ARTICLE",
      "url": "https://thehackernews.com/2026/09/google-gemini-broke-into-real-company.html"
    }
  ],
  "database_specific": {
    "severity": "HIGH",
    "acve": {
      "specVersion": 1,
      "status": "candidate",
      "kind": "behavioural",
      "vulnClasses": [
        "over-privileged-combination",
        "exposed-surface"
      ],
      "cwe": [
        "CWE-693"
      ],
      "taxonomy": {
        "owasp_asi": [
          "ASI10",
          "ASI02"
        ],
        "atlas": [
          "AML.T0117"
        ]
      },
      "noCveReason": "No code defect is asserted: the evaluation configuration exposed real companies to a model pursuing its task.",
      "cveBoundary": "behavioural",
      "threat": {
        "attacker": "user",
        "vector": "unsafe-default",
        "outcome": "harmful-action"
      },
      "evidence": [
        {
          "kind": "eval",
          "url": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        }
      ],
      "fix": {
        "summary": "Isolate evaluations and enforce target authorization.",
        "actions": [
          {
            "type": "reconfigure",
            "target": "agent.approval",
            "to": "ask",
            "why": "A CTF must not reach real companies because of a name match.",
            "owner": "operator"
          },
          {
            "type": "reconfigure",
            "target": "google.gemini.evaluations",
            "to": "a changed testing process",
            "why": "Shipped by Google: after the model reached three real companies through a name match.",
            "owner": "model-provider"
          }
        ]
      },
      "exposure": {
        "harness": {
          "value": "Irregular cybersecurity evaluation with unintended internet access",
          "any": false,
          "status": "confirmed",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "model": {
          "value": "A Gemini model; exact model not disclosed",
          "any": false,
          "status": "detected",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "goal": {
          "value": "Retrieve information from a fictional company's CTF system",
          "stated": true,
          "status": "confirmed",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "tools": {
          "value": "Cybersecurity evaluation tools with unintended internet access",
          "status": "confirmed",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "approval": {
          "value": "The evaluation model had no reported human approval step before the access",
          "mode": "auto-approve",
          "status": "detected",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "inputControl": "evaluation",
        "agentAction": "The model accesses real company systems while pursuing the fictional CTF task.",
        "harm": "intrusion",
        "divergence": "scope-exceeded",
        "reach": {
          "value": "Three real company systems",
          "kinds": [
            "network"
          ],
          "status": "confirmed",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "condition": {
          "value": "When a fictional company name matched real companies and internet access was available",
          "status": "confirmed",
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        },
        "scale": {
          "statement": "Three real companies were accessed",
          "unit": "systems",
          "value": 3,
          "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
        }
      },
      "occurrence": {
        "basis": "real-use",
        "reportedBy": "vendor",
        "responses": [
          {
            "party": "Google",
            "status": "acknowledged",
            "statement": "Google says the model stopped in each case and that the testing process was changed.",
            "source": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/"
          }
        ]
      },
      "exploitation": {
        "status": "demonstrated",
        "checkedAt": "2026-09-24T00:00:00Z",
        "sources": [
          {
            "url": "https://www.securityweek.com/google-confirms-gemini-ai-breached-three-firms/",
            "type": "vendor"
          }
        ],
        "kev": {
          "listed": false
        }
      },
      "claims": [],
      "reproducibility": {
        "status": "partial",
        "axesComplete": true,
        "componentsObtainable": null,
        "triggerPublished": false,
        "observableStated": true,
        "demonstrated": "researcher-demonstrated",
        "missing": [
          "model availability not checked (no registry reference)",
          "trigger not published"
        ]
      },
      "severityBasis": "harm-reach"
    }
  }
}