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    CVE-2026-58057

    Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.

    Published:Jun 28, 2026
    Last Modified:Jun 29, 2026
    EPS:Jun 28, 2026
    EPSS Score:0.0024
    CVSS Score:5

    Affected Products

    Vendor
    Flowiseai
    Product
    Flowise

    Exploits

    https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-pochttps://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivityhttps://www.exploit-db.com/exploits/52623https://github.com/CerberusMrXi/Flowise-CVE-2026-58057-exploit

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High