Horizon Alert
Summary of the vulnerability and why it matters
This issue in Flowise allows an authenticated user to execute arbitrary commands on the underlying operating system. It involves an unsafe way of handling commands within a specific configuration, potentially leading to a complete compromise of the affected system.
- Code execution on servers.
- Impacts systems with custom MCP adapters.
- Requires existing access.
Attack Path
How an attacker could exploit the issue
An authenticated attacker can exploit this vulnerability by adding a custom MCP server and configuring it with an arbitrary command to achieve remote code execution. This leverages an insecure serialization flaw in the MCP adapter that bypasses input sanitization checks.
- Requires authenticated access.
- Targets Flowise's custom MCP configuration.
- Bypasses input validation for command execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Flowise allows an authenticated attacker to achieve arbitrary command execution by exploiting unsafe serialization in its MCP adapter. Attackers are likely to target this because it enables them to gain a foothold on the server, potentially leading to further compromise or data exfiltration within an organization's internal network, especially since the affected component is tied to LLM workflow customization.
- Exploitation requires authentication.
- Public exploit code is available.
- Exploitation is recent and ongoing.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize patching Flowise to version 3.1.0 or later to address the critical command execution vulnerability. If immediate patching is not feasible, isolate affected services or restrict access to the Flowise UI to prevent exploitation.
- Upgrade Flowise to 3.1.0+.
- Isolate or restrict UI access.
- Monitor for suspicious command execution.
