CVE-2026-58057
Published:June 28, 2026
Updated:August 04, 2026
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 Packages
https://github.com/FlowiseAI/Flowise.git (GITHUB):
Affected version(s) >=flowise-ui@1.0.0 <flowise-ui@3.1.3Fix Suggestion:
Update to version flowise-ui@3.1.3flowise (NPM):
Affected version(s) >=1.0.0 <3.1.3Fix Suggestion:
Update to version 3.1.3Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Improper Handling of Case Sensitivity
EPSS
Base Score:
1.27