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    CVE-2026-73601

    Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.

    Published:Aug 13, 2026
    Last Modified:Sep 4, 2026
    EPS:Aug 13, 2026
    EPSS Score:0.00606
    CVSS Score:8.8

    Affected Products

    Vendor
    Flowiseai
    Product
    Flowise

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-35 Leverage Executable Code in Non-Executable Files

    Related CVEs

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    CVE-2026-73603 (CVSS 6.3) — Flowise before 3.1.4 fails to validate chatflow visibility in the unauthenticated text-to-speech endpoint, all…
    CVE-2026-73602 (CVSS 9) — Flowise before 3.1.3 contains a sandbox escape vulnerability in the vm2 JavaScript sandbox that allows authent…
    CVE-2026-73488 (CVSS 6) — Flowise versions before 3.1.3 contain an insecure direct object reference vulnerability in the GET /api/v1/org…
    CVE-2026-73487 (CVSS 9) — Flowise before 3.1.3 contains a regex-based Python code validator bypass in CSV and Airtable Agent nodes that …
    CVE-2026-73486 (CVSS 9) — Flowise before 3.1.3 contains a code injection vulnerability in the CSV Agent node's customReadCSV parameter t…
    CVE-2026-73485 (CVSS 9) — Flowise before 3.1.3 contains a code injection vulnerability in the Airtable Agent node that allows unauthenti…
    CVE-2026-73484 (CVSS 8.6) — Flowise before 3.1.3 contains a sandbox escape vulnerability in pythonCodeValidator.ts that fails to block nat…
    CVE-2026-73483 (CVSS 9.4) — Flowise (packages flowise and flowise-components) in versions <= 3.1.2 contain a sandbox escape in the vm2/@fl…

    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