Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-7664",
    "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
    "assignerShortName": "ibm",
    "dateUpdated": "2026-06-23T03:55:58.300Z",
    "dateReserved": "2026-05-01T19:46:59.287Z",
    "datePublished": "2026-06-22T14:10:25.584Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
        "shortName": "ibm",
        "dateUpdated": "2026-06-22T14:10:25.584Z"
      },
      "title": "Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS",
      "descriptions": [
        {
          "lang": "en",
          "value": "IBM Langflow OSS 1.0.0 through 1.8.4 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.",
          "supportingMedia": [
            {
              "type": "text/html",
              "base64": false,
              "value": "<p>IBM Langflow OSS 1.0.0 through 1.8.4 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.</p>"
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "IBM",
          "product": "Langflow OSS",
          "cpes": [
            "cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:langflow_oss:1.8.4:*:*:*:*:*:*:*"
          ],
          "versions": [
            {
              "version": "1.0.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "1.8.4"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-287 Improper Authentication",
              "cweId": "CWE-287",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://www.ibm.com/support/pages/node/7277243",
          "tags": [
            "vendor-advisory",
            "patch"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ],
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL"
          }
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "IBM strongly recommends addressing the vulnerability now by upgrading  Langflow OSS to version 1.9.1 https://pypi.org/project/langflow/",
          "supportingMedia": [
            {
              "type": "text/html",
              "base64": false,
              "value": "<p>IBM strongly recommends addressing the vulnerability now by upgrading <a href=\"https://pypi.org/project/langflow/\" rel=\"nofollow\">Langflow OSS to version 1.9.1</a></p>"
            }
          ]
        }
      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-06-23T03:55:58.300Z"
        },
        "title": "CISA ADP Vulnrichment",
        "metrics": [
          {}
        ]
      }
    ]
  }
}