CVE-2026-58057: Flowiseai Flowise

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

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.

Affected products

• Flowiseai Flowise: before 3.1.3 (fixed in 3.1.3)

Published 2026-06-28. Last modified 2026-07-06.