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ID:12863 - Exploit for Incomplete List of Disallowed Inputs in Flowise - CVE-2025-8943
ID:12863 - Exploit for Incomplete List of Disallowed Inputs in Flowise - CVE-2025-8943
Published: July 30, 2026
Vulnerability identifier: #VU140077
Vulnerability risk: Medium
CVE-ID: CVE-2025-8943
CWE-ID: CWE-184
Exploitation vector: Remote access
Vulnerable software:
Flowise
Flowise
Link to public exploit:
Vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to incomplete list of disallowed inputs in packages/components/nodes/tools/MCP/core.ts when processing MCP server environment variables for child process execution. A remote user can set npm_config_yes=true in a crafted MCP server configuration to execute arbitrary code.
This issue can be triggered even when CUSTOM_MCP_SECURITY_CHECK=true is enabled.
Remediation
Install security update from vendor's website.