{
    "id": "CVE-2026-56274",
    "published": "2026-06-23 13:16:45",
    "last_modified": "2026-06-25 18:39:19",
    "cvss_score": "9.9",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
    "cwe": "CWE-78",
    "description": "Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.",
    "epss_score": "0.07521",
    "epss_percentile": "0.94325",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-05 18:17:53",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.9), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "flowiseai",
            "product": "flowise"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m99r-2hxc-cp3q",
        "https://www.vulncheck.com/advisories/flowise-remote-code-execution-via-mcp-security-bypass-in-validatecommandflags-and-validateargsforlocalfileaccess",
        "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m99r-2hxc-cp3q"
    ]
}