CVE-2026-31829

Description:
Flowise exposes an HTTP Node in AgentFlow and Chatflow that performs server-side HTTP requests using user-controlled URLs. By default, there are no restrictions on target hosts, including private/internal IP ranges (RFC 1918), localhost, or cloud metadata endpoints.
This enables Server-Side Request Forgery (SSRF), allowing any user interacting with a publicly exposed chatflow to force the Flowise server to make requests to internal network resources that are inaccessible from the public internet.

Impact includes:

• Access to internal admin panels (e.g., internal company dashboards, Jenkins, Kubernetes API, etc.).
• Retrieval of cloud provider metadata (e.g., AWS IMDSv1 at [http://169.254.169.254], GCP, Azure).
• Port scanning and enumeration of internal services.
• Potential lateral movement or privilege escalation in compromised environments.

This vulnerability is particularly severe because:

• Flowise instances are often deployed publicly without authentication (FLOWISE_USERNAME/PASSWORD not set by default).
• The HTTP Node is easily accessible in simple flows with minimal configuration.

Proof of Concept (PoC):
A minimal flow consisting of three nodes demonstrates successful internal network access:
Flow Structure:

HTTP Node Configuration:
The HTTP Node is configured to perform a GET request to an internal address on localhost:
URL: http://127.0.0.1:8000 (or any internal service)

Successful Response from Internal Service:
When the flow is triggered via chat input, the Flowise server successfully retrieves and returns content from the internal mock server running on port 8000 within the same container/network:

Impact
This is a Server-Side Request Forgery (SSRF) vulnerability with both read and write capabilities.
The HTTP Request node supports all standard HTTP methods (GET, POST, PUT, PATCH, DELETE), allowing attackers to not only retrieve sensitive information but also modify, create, or delete data on internal services if those services expose mutable endpoints:

• Read access: Retrieval of sensitive internal data, cloud provider metadata (e.g., AWS IAM credentials at http://169.254.169.254/latest/meta-data/iam/security-credentials/), secrets, configuration files, or database contents.
• Write access: Modification or deletion of internal resources via POST/PUT/PATCH/DELETE methods (e.g., creating malicious users/configurations, overwriting files, deleting data, triggering destructive actions on internal admin panels, CI/CD systems like Jenkins, Kubernetes APIs, or cloud management interfaces).
  Amplification: Retrieved cloud credentials can be used for further privilege escalation or lateral movement outside the n8n instance.

Suggested Long-term Fix (for Flowise):

• Add optional security controls to HTTP Node:
• Toggle: "Block private IP ranges and localhost" (enabled by default).
• Field: "Allowed domains" (whitelist).
• Display prominent warning when URL field uses template variables (e.g., {{ }}).
• Update documentation with explicit SSRF risks and best practices.

Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.

CVE-2026-31829 has a CVSS score of 7.1 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.0.13); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-31829? CVE-2026-31829 is a high-severity server-side request forgery (SSRF) vulnerability in flowise (npm), affecting versions <= 3.0.12. It is fixed in 3.0.13. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
2. How severe is CVE-2026-31829? CVE-2026-31829 has a CVSS score of 7.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2026-31829?
   • flowise (npm) (versions <= 3.0.12)
   • flowise-components (npm) (versions <= 3.0.12)
4. Is there a fix for CVE-2026-31829? Yes. CVE-2026-31829 is fixed in 3.0.13. Upgrade to this version or later.
5. Is CVE-2026-31829 exploitable, and should I be worried? Whether CVE-2026-31829 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-31829 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-31829?
   • Upgrade flowise to 3.0.13 or later
   • Upgrade flowise-components to 3.0.13 or later