Flowise affected by Server-Side Request Forgery (SSRF) in HTTP Node Leading to Internal Network Access

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: <img width="1131" height="323" alt="image" src="https://github.com/user-attachments/assets/f6ddc74f-3ae9-4376-995a-693fb272627a" /> 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) <img width="568" height="759" alt="image" src="https://github.com/user-attachments/assets/a5735e1f-f735-4d01-9d72-a772963254c8" />

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: <img width="377" height="627" alt="image" src="https://github.com/user-attachments/assets/ff3fcfc6-4957-4aae-9c9d-13b4fca1d0ef" />

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 ), secrets, configuration files, or database contents.