Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User’s Flow_CVE-2026-55255

{
    "lastseen": "",
    "description": "Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.2.",
    "published": "2026-06-23T16:28:20.985Z",
    "modified": "2026-06-23T17:32:52.375Z",
    "type": "cve",
    "title": "Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow",
    "source": "GitHub_M",
    "references": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2\nhttps://github.com/langflow-ai/langflow/pull/12832",
    "id": "CVE-2026-55255",
    "bulletinFamily": "",
    "cwe": [
        "CWE-639"
    ],
    "cvelist": null,
    "sourceData": "langflow-ai langflow < 1.9.2",
    "sourceHref": "",
    "cvss": {
        "score": 9.9,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "langflow",
    "version": "< 1.9.2",
    "vendor": "langflow-ai",
    "ai_description": "Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint",
    "ai_severity": "Critical",
    "ai_vendor": "Langflow-ai",
    "ai_product": "Langflow",
    "ai_version": "< 1.9.2",
    "ai_score": 9.9
}