CVE-2026-91931: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in FlowiseAI Flowise
Flowise before 3.1.4 contains a remote code execution vulnerability in the Custom MCP node that allows authenticated attackers to execute arbitrary code by supplying npx package names in the mcpServerConfig parameter. Attackers can invoke npx with attacker-controlled npm packages to execute code on the Flowise server.
AI Analysis
Technical Summary
CVE-2026-91931 is an OS command injection vulnerability in Flowise before version 3.1.4. The flaw exists in the Custom MCP node where the mcpServerConfig parameter accepts npx package names. An attacker with authentication privileges can supply attacker-controlled npm packages to invoke npx, resulting in arbitrary code execution on the server hosting Flowise.
Potential Impact
Successful exploitation allows an authenticated attacker to execute arbitrary code on the Flowise server, potentially leading to full system compromise, data loss, or disruption of service. The CVSS 3.1 score of 8.5 reflects high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade Flowise to version 3.1.4 or later, where this vulnerability is fixed. Since the affected versions are prior to 3.1.4, applying this official fix eliminates the risk. No other mitigation guidance is provided.
CVE-2026-91931: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in FlowiseAI Flowise
Description
Flowise before 3.1.4 contains a remote code execution vulnerability in the Custom MCP node that allows authenticated attackers to execute arbitrary code by supplying npx package names in the mcpServerConfig parameter. Attackers can invoke npx with attacker-controlled npm packages to execute code on the Flowise server.
CVSS v3.1
Score 8.5high
Affected software
FlowiseAI
Flowise
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-91931 is an OS command injection vulnerability in Flowise before version 3.1.4. The flaw exists in the Custom MCP node where the mcpServerConfig parameter accepts npx package names. An attacker with authentication privileges can supply attacker-controlled npm packages to invoke npx, resulting in arbitrary code execution on the server hosting Flowise.
Potential Impact
Successful exploitation allows an authenticated attacker to execute arbitrary code on the Flowise server, potentially leading to full system compromise, data loss, or disruption of service. The CVSS 3.1 score of 8.5 reflects high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade Flowise to version 3.1.4 or later, where this vulnerability is fixed. Since the affected versions are prior to 3.1.4, applying this official fix eliminates the risk. No other mitigation guidance is provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-15T11:06:02.263Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa9651855bf5e2cf502eaf9
Added to database: 09/15/2026, 15:32:40 UTC
Last enriched: 09/15/2026, 16:02:41 UTC
Last updated: 09/16/2026, 02:31:58 UTC
Views: 8
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