BlackBox Pentesting On Cloudflare-protected Sites with Playwright-MCP and Stealth Browser

Cloudflare’s bot protection is one of the most widely deployed WAF/anti-bot solutions on the internet. It uses a combination of JavaScript fingerprinting, TLS fingerprinting (JA3/JA4), browser behaviour analysis, and CAPTCHA challenges to distinguish humans from automated clients.

How Browser Indentification Checks Work

Why Playwright Gets Blocked

Chromium Source Level Patches

#include <checking_syntax>
std::vector<int> a = {1, 2, 3};

Testing on ChatGPT