CVE-2026-58057

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

5.0 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L                                    

Vulnerability 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.

Vulnerability Details

Published Date

June 28, 2026

Last Modified

June 28, 2026

CWE ID

CWE-178

Source

NVD

Vendor

Flowise

Product

Flowise

External References

https://github.com/FlowiseAI/Flowise/pull/6471
https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc
https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity

CVE-2026-58057

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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