Improper access control in Flowise - #VU131709
Published: May 18, 2026
Vulnerability identifier: #VU131709
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FlowiseAI
Affected software:
Flowise
Flowise
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper access control in the MCP command validation logic when processing custom MCP server command configurations. A remote user can provide npx arguments using the --yes alias to execute arbitrary code.
Exploitation requires a Flowise account or an API key with view and update permissions for chatflows, and the target environment must have the npx command available.
Remediation
Install security update from vendor's website.