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Cloudsneak is a Python service for automated solving of Cloudflare challenge mechanisms. It renders Turnstile widgets to capture cf-response tokens and intercepts IUAM (I’m Under Attack Mode) responses to extract cf_clearance cookies and their matching User-Agent.

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What Cloudsneak does

  • Turnstile token solver: Renders and solves Cloudflare Turnstile challenge widgets using synthetic injection and local script replacement.
  • IUAM clearance extraction: Intercepts responses to extract cf_clearance cookies and the corresponding User-Agent.
  • Anti-detect browser: Custom Chromium launch configuration driven by Playwright.
  • FastAPI REST API: Async server with TTL caching, auth token checks, and concurrency throttling.

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Architecture

Cloudsneak launches anti-detect Chromium instances and intercepts challenge scripts at the network layer. For Turnstile it renders synthetic DOM targets that trigger the widget callback; for IUAM it extracts Set-Cookie headers from Under Attack Mode responses. An in-memory TTL cache prevents redundant solves for frequent requests.

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Get started

Quickstart

Install Cloudsneak, run the server, and solve your first challenge in under 5 minutes.

Solve Cloudflare

Reference for the POST /cloudflare endpoint, including Turnstile and IUAM modes.