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VULNERABILITIES

CVE-2026-58057 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc [email protected]ExploitThird Party Advisory
https://github.com/FlowiseAI/Flowise/pull/6471 [email protected]Issue TrackingPatch
https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity [email protected]ExploitPatchThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-178Improper Handling of Case Sensitivity[email protected]

Affected Products

ProductVersions
flowiseai flowise
< 3.1.3

CPE

  • cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-58057
NVD Published Date:
Jun 28, 2026
NVD Last Modified:
Jul 6, 2026
Source:
[email protected]
CVE-2026-58057 Details - Not Deferred