CVE-2026-58057 — Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity
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-insen…
Published: 2026-06-28 · CVSS: 2.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7