1## autogenerated on 2026-06-17 10:34:05
2name: crowdsecurity/vpatch-CVE-2025-59528
3description: 'Detects Flowise CustomMCP node RCE via unsafe evaluation in convertToValidJSONString.'
4rules:
5  - and:
6      - zones:
7          - URI
8        transform:
9          - lowercase
10        match:
11          type: contains
12          value: /api/v1/node-load-method/custommcp
13      - zones:
14          - BODY_ARGS
15        variables:
16          - json.inputs.mcpserverconfig
17        transform:
18          - urldecode
19          - lowercase
20        match:
21          type: contains
22          value: 'function('
23
24labels:
25  type: exploit
26  service: http
27  confidence: 3
28  spoofable: 0
29  behavior: 'http:exploit'
30  label: 'Flowise - RCE'
31  classification:
32    - cve.CVE-2025-59528
33    - attack.T1190
34    - cwe.CWE-94
35