Flowise: Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a…
Flowise
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- Severity
- Medium, CVSS 5.0
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- Record
- CVE-2026-58057
- Affects
- Flowise
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- June 28, 2026
- Source last modified
- October 25, 2026
Description
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.
Description quoted from the NVD record.