Medium severity5.0NVD Advisory· Published Jun 28, 2026· Updated Jul 6, 2026
CVE-2026-58057
CVE-2026-58057
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.
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/FlowiseAI/Flowise/pull/6471nvdIssue TrackingPatch
- github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-pocnvdExploitThird Party Advisory
- www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivitynvdExploitPatchThird Party Advisory
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