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CVE-2026-58057

Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity

Published: Jun 28, 2026Updated: Jul 6, 2026 Sources: CVE List NVDCWE-178
5.0MEDIUM
NVD MITRE
EPSS Score
1.3%
Top 32.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-178

Affected Products

flowiseai
oss-projectaka flowise, embed, flowise-components
flowiseOn-premWeb App
AI / ML / ai-agent-tooling
Flowise
oss-projectaka flowise-ai
FlowiseSaaS
AI / ML / ai-agent-tooling

Exploitability

Official Patch Available
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References

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

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