CVE-2026-58057
5
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Flowise | Flowise | 0 < 3.1.3 | affected |
| Flowise | Flowise | 3.1.3 | unaffected |
Weaknesses
- CWE-178: Improper Handling of Case Sensitivity
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: no
- Technical Impact: partial
References
- https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc
- https://github.com/FlowiseAI/Flowise/pull/6471
- https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.