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* fix(security): disable credentials for wildcard CORS origins (CWE-942) Langflow defaults to cors_origins="*" with cors_allow_credentials=True. With a wildcard origin AND credentials, Starlette reflects the caller's Origin and returns Access-Control-Allow-Credentials: true, so any website can make credentialed cross-origin requests on behalf of a logged-in user (CSRF / credential theft). Force allow_credentials=False at the CORS middleware whenever the configured origin list is a wildcard. Specific (non-wildcard) origins continue to allow credentials, so properly-configured multi-origin deployments are unaffected. * [autofix.ci] apply automated fixes * [autofix.ci] apply automated fixes (attempt 2/3) * fix(security): warn when wildcard CORS origin disables credentials Share a single cors_origins_contain_wildcard() predicate between warn_about_future_cors_changes and the middleware CORS config so the two wildcard checks can't drift, and log an explicit warning when a wildcard origin forces allow_credentials off. Previously the list-form wildcard (e.g. LANGFLOW_CORS_ORIGINS="https://app.com,*" -> ["https://app.com", "*"]) disabled credentials silently: the permissive-defaults warning only matched the bare "*" string, so an operator who set credentials on purpose got no log line pointing at the wildcard. The shared predicate now catches every wildcard shape, and the middleware surfaces the override (only when credentials were actually on) so the cause is visible. --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Langflow is a powerful platform for building and deploying AI-powered agents and workflows. It provides developers with both a visual authoring experience and built-in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools.
✨ Highlight features
- Visual builder interface to quickly get started and iterate.
- Source code access lets you customize any component using Python.
- Interactive playground to immediately test and refine your flows with step-by-step control.
- Multi-agent orchestration with conversation management and retrieval.
- Deploy as an API or export as JSON for Python apps.
- Deploy as an MCP server and turn your flows into tools for MCP clients.
- Observability with LangSmith, LangFuse and other integrations.
- Enterprise-ready security and scalability.
🖥️ Langflow Desktop
Langflow Desktop is the easiest way to get started with Langflow. All dependencies are included, so you don't need to manage Python environments or install packages manually. Available for Windows and macOS.
⚡️ Quickstart
Install locally (recommended)
Requires Python 3.10–3.14 and uv (recommended package manager).
Install
From a fresh directory, run:
uv pip install langflow -U
The latest Langflow package is installed. For more information, see Install and run the Langflow OSS Python package.
Run
To start Langflow, run:
uv run langflow run
Langflow starts at http://127.0.0.1:7860.
That's it! You're ready to build with Langflow! 🎉
📦 Other install options
Run from source
If you've cloned this repository and want to contribute, run this command from the repository root:
make run_cli
For more information, see DEVELOPMENT.md.
Docker
Start a Langflow container with default settings:
docker run -p 7860:7860 langflowai/langflow:latest
Langflow is available at http://localhost:7860/. For configuration options, see the Docker deployment guide.
🛡️ Security
For security information, see our Security Policy.
🚀 Deployment
Langflow is completely open source and you can deploy it to all major deployment clouds. To learn how to deploy Langflow, see our Langflow deployment guides.
⭐ Stay up-to-date
Star Langflow on GitHub to be instantly notified of new releases.
👋 Contribute
We welcome contributions from developers of all levels. If you'd like to contribute, please check our contributing guidelines and help make Langflow more accessible.