{
  "schema_version": "1.6.0",
  "id": "ACVE-2026-0532",
  "aliases": [],
  "published": "2026-09-10T00:00:00Z",
  "firstReported": {
    "date": "2026-09-10",
    "url": "https://www.anthropic.com/threat-intelligence-report-september-2026",
    "publisher": "Anthropic"
  },
  "modified": "2026-09-25T00:00:00Z",
  "summary": "GTG-50021 ran a fraudulent Claude reseller proxy that silently routed customers to another model while using Claude to build credential-harvesting tooling for Anthropic account credentials.",
  "details": "## What\n\nAnthropic says a Russian- and Ukrainian-speaking group offered discounted Claude access through a fraudulent reseller. Customers' traffic was silently proxied to another model, while the reseller's tooling harvested Anthropic account credentials and sold them to other AI proxy resellers.\n\n## Detection\n\nAnthropic identified and disrupted the activity. Recorded from Anthropic's September 2026 threat report. Not recreated in a lab.\n\n## Fix\n\nUse authorized AI access channels, keep account credentials out of reseller tooling, and monitor proxy services for credential harvesting.",
  "affected": [
    {
      "package": {
        "ecosystem": "AgentHarness",
        "name": "claude"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "REPORT",
      "url": "https://www.anthropic.com/threat-intelligence-report-september-2026"
    },
    {
      "type": "ARTICLE",
      "url": "https://thenextweb.com/news/anthropic-claude-misuse-threat-intelligence-report"
    }
  ],
  "database_specific": {
    "severity": "CRITICAL",
    "acve": {
      "specVersion": 1,
      "status": "candidate",
      "kind": "behavioural",
      "vulnClasses": [
        "credential-theft",
        "data-exfiltration"
      ],
      "cwe": [
        "CWE-522",
        "CWE-359"
      ],
      "noCveReason": "No code defect: the harm arose from an attacker using Claude to operate a fraudulent reseller and credential harvester.",
      "cveBoundary": "behavioural",
      "threat": {
        "attacker": "user",
        "vector": "unsafe-default",
        "outcome": "exfiltration"
      },
      "evidence": [
        {
          "kind": "incident",
          "url": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        }
      ],
      "fix": {
        "summary": "The operator was the attacker, so the control that protects the reseller's customers is the model provider's: Anthropic disrupted the operation and strengthened safeguards.",
        "actions": [
          {
            "type": "reconfigure",
            "target": "anthropic.safeguards",
            "to": "strengthened after the operation was disrupted",
            "why": "Shipped by Anthropic: it disrupted GTG-50021 and strengthened safeguards.",
            "owner": "model-provider"
          }
        ]
      },
      "exposure": {
        "harness": {
          "value": "Claude used in a fraudulent AI reseller operation",
          "any": false,
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        },
        "model": {
          "value": "Claude; exact model not stated",
          "any": false,
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        },
        "goal": {
          "value": "Build credential-harvesting tooling for customers of a fraudulent Claude reseller",
          "stated": true,
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        },
        "tools": {
          "value": "Fraudulent reseller proxy and credential-harvesting tooling",
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        },
        "approval": {
          "value": "Customers' traffic and credentials were handled by the reseller's automated proxy",
          "mode": "auto-approve",
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        },
        "inputControl": "operator",
        "agentAction": "The agent helps operate a reseller proxy that harvests customers' Anthropic account credentials.",
        "harm": "credential-theft",
        "divergence": "decomposed-misuse",
        "reach": {
          "value": "Anthropic customer accounts and session credentials",
          "kinds": [
            "cloud-credentials",
            "api-keys"
          ],
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        },
        "condition": {
          "value": "When customers routed their Claude traffic through the fraudulent reseller",
          "status": "confirmed",
          "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
        }
      },
      "occurrence": {
        "basis": "real-use",
        "reportedBy": "vendor",
        "responses": [
          {
            "party": "Anthropic",
            "status": "fixed",
            "statement": "Anthropic says it disrupted the activity and strengthened safeguards.",
            "source": "https://www.anthropic.com/threat-intelligence-report-september-2026"
          }
        ]
      },
      "exploitation": {
        "status": "none-known",
        "checkedAt": "2026-09-24T00:00:00Z",
        "sources": [
          {
            "url": "https://www.anthropic.com/threat-intelligence-report-september-2026",
            "type": "research",
            "note": "Anthropic reported a real operation."
          }
        ],
        "kev": {
          "listed": false
        }
      },
      "claims": [],
      "reproducibility": {
        "status": "partial",
        "axesComplete": true,
        "componentsObtainable": null,
        "triggerPublished": false,
        "observableStated": true,
        "demonstrated": "reported-only",
        "missing": [
          "model availability not checked (no registry reference)",
          "trigger not published"
        ]
      },
      "severityBasis": "harm-reach"
    }
  }
}