{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-55255",
  "revision": 1,
  "title": "Langflow — cross-tenant flow execution via unchecked flow id",
  "summary": "Langflow before 1.9.1 does not check who owns a flow: a signed-in user who names another user's flow identifier on the responses endpoint has that flow executed for them, reaching the other tenant's data and integrations.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 8.4,
    "vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L",
    "version": "3.1"
  },
  "epss": 0.00887,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "high",
    "kev_added": "2026-07-07",
    "prerequisites": "Any authenticated account on the Langflow instance, plus the identifier of the target flow."
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "Langflow 1.9.1"
    ]
  },
  "kill_chain": "execution",
  "recommended_action": "Upgrade Langflow to 1.9.1 or later now; review flow run records for executions triggered by accounts that do not own the flow.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-55255",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2026-55255",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-55255",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55255",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/langflow-ai/langflow/pull/12832"
    },
    {
      "type": "exploit",
      "url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2"
    }
  ],
  "published_at": "2026-06-23T17:17:08.050Z",
  "issued_at": "2026-09-23T07:33:20.707Z",
  "tags": [
    "langflow",
    "idor",
    "broken-access-control",
    "ai-tooling",
    "kev"
  ]
}