Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS_CVE-2026-7664

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-22T14:10:25.584Z",
    "modified": "2026-06-22T14:10:25.584Z",
    "type": "cve",
    "title": "Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS",
    "source": "ibm",
    "references": "https://www.ibm.com/support/pages/node/7277243",
    "id": "CVE-2026-7664",
    "bulletinFamily": "",
    "cwe": [
        "CWE-287"
    ],
    "cvelist": null,
    "sourceData": "IBM Langflow OSS 1.0.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Langflow OSS",
    "version": "1.0.0",
    "vendor": "IBM",
    "ai_description": "Unauthenticated attackers can access protected MCP project resources and execute MCP operations due to improper authorization in the Streamable MCP transport endpoint.",
    "ai_severity": "Critical",
    "ai_vendor": "IBM",
    "ai_product": "Langflow OSS",
    "ai_version": "1.0.0-1.8.4",
    "ai_score": 9.8
}