CVE-2026-91931 Flowise - Remote Code Execution

Flowise < 3.1.4 contains a remote code execution caused by improper validation of npx package names in the Custom MCP node's mcpServerConfig parameter, letting authenticated attackers execute arbitrary code on the server.

CVSS base score 8.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.68% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-78

Vendor fix

Upgrade to version 3.1.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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