PT-2026-53089 · Undefined · Undefined

Published 2026-06-28 · Updated 2026-06-28 · CVE-2026-58057

NVD

CVSS v3.1

5.0

Medium

Base vector

AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

Exploit

Fix

Weakness Enumeration

CWE-178

Related Identifiers

CVE-2026-58057

Affected Products

Undefined

References · 4

• 🔥 https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58057 · Security Note
• https://vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity · Note
• https://github.com/FlowiseAI/Flowise/pull/6471 · Note