Main Vulnerability Database Vulnerabilities #VU140077

Incomplete List of Disallowed Inputs in Flowise - CVE-2025-8943

Published: July 30, 2026

Vulnerability identifier: #VU140077

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2025-8943

CWE-ID: CWE-184

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

Vulnerability details

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.