External risk intelligence

Flowise allows attackers full control of your systems via a single request.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-41268

An external attacker can exploit a flaw in Flowise to gain full control of the server without needing a login. This could allow them to steal sensitive data and potentially access other areas of our network.

3Halo Surface Signal

Flowiseai Flowise

before 3.1.0

External exposure likelihood

Halo Surface Signal score for CVE-2026-41268

Flowise is a web-based interface for building LLM workflows. While it functions as a network-accessible web application, it is commonly deployed as an internal tool for development, data science, or engineering teams rather than as a service intended for public internet exposure.

Horizon Alert

Summary of the vulnerability and why it matters

This critical vulnerability in Flowise allows for unauthenticated remote command execution. Attackers can exploit a parameter override bypass to run arbitrary system commands with root privileges within the Flowise container.

  • No authentication needed
  • Requires single HTTP request
  • Root privileges gained

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending a crafted HTTP request to an unauthenticated Flowise instance. This request manipulates parameters to inject commands, allowing arbitrary code execution with root privileges within the container.

  • No authentication required
  • Target Flowise web interface
  • Requires specific parameter injection

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Flowise presents a clear path for attackers to execute arbitrary commands with root privileges remotely and without authentication. The ease of exploitation, combined with the critical nature of the vulnerability, suggests a high likelihood of weaponization by threat actors targeting environments using affected versions. While the tool may often be used internally, its network accessibility and the severity of the flaw make it an attractive target.

  • Exploitable via HTTP request.
  • No authentication required.
  • Critical command execution.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize patching or upgrading Flowise instances to version 3.1.0 or later immediately due to the critical unauthenticated remote command execution vulnerability. If immediate patching is not feasible, isolate affected services from the network or restrict access to prevent exploitation.

  • Upgrade Flowise to 3.1.0+.
  • Isolate affected services from network.
  • Monitor for suspicious outbound connections.

Frequently asked questions

What is Flowise and what does it do?

Flowise is a visual interface designed to help users build custom large language model (LLM) applications by connecting various components. It is commonly utilized by developers and data scientists for creating and managing AI workflows.

What is the weakness class for CVE-2026-41268?

The weakness class identified for CVE-2026-41268 is CWE-20, which pertains to improper input validation. This indicates that the software did not adequately verify the data it received, potentially allowing for the processing of unintended commands.

How can an attacker execute commands using Flowise?

An attacker can exploit this vulnerability by sending a specially crafted HTTP request to an unauthenticated Flowise instance. This request leverages a parameter override bypass, combined with specific keywords and environment variable injection, to execute arbitrary system commands with root privileges within the containerized Flowise environment. This requires only a single HTTP request and no prior authentication or knowledge of the instance.

What is the significance of the Halo Surface Signal for this vulnerability?

The Halo Surface Signal indicates a 'Possible' threat level, scoring 3. This is because Flowise, while a network-accessible web application, is typically deployed as an internal tool for development or data science teams rather than being exposed directly to the public internet.

What are the immediate steps to address the Flowise vulnerability?

To address this critical vulnerability, it is imperative to upgrade Flowise instances to version 3.1.0 or later as soon as possible. If immediate patching is not possible, isolating the affected services from the network or restricting access is a recommended interim measure to prevent exploitation. Monitoring for any suspicious outbound network connections is also advised.

References