Incomplete List of Disallowed Inputs in Flowise - CVE-2025-8943
Published: July 30, 2026
Vulnerability identifier: #VU140077
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:A/U:Green
CVE-ID: CVE-2025-8943
CWE-ID: CWE-184
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Affected software:
Flowise
Flowise
Detailed 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.
How to mitigate CVE-2025-8943
Install security update from vendor's website.