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MalwareJun 5, 2026

๐Ÿšจ A threat actor known as welcometonightbrother is sharing source code that allegedly bypasses C...

Threat actor welcometonightbrother releases alleged Cloudflare Turnstile CAPTCHA bypass tool.

A threat actor using the handle welcometonightbrother has publicly shared source code claiming to bypass Cloudflare's Turnstile bot-detection and CAPTCHA system. The tool reportedly operates in a browser-based context, potentially enabling automated attacks against protected websites. This disclosure represents an active threat to web security infrastructure relying on Turnstile for bot mitigation.

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The lesson from this incident

Full lesson

A threat actor has publicly released source code claiming to bypass Cloudflare's Turnstile system, which many organizations rely on for bot protection. This represents a critical vulnerability in web application defense mechanisms that could enable automated attacks against protected websites. Organizations using Turnstile or similar bot detection systems now face increased risk of credential stuffing, scraping, and other automated attacks. The public release of bypass techniques demonstrates how quickly security controls can be compromised once weaknesses are discovered and shared.

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Indicators of Compromise

Extracted by AI from the linked source. Not reviewed by an editor. How this works

  • url โ€” https://t.co/xnsKTtftJf

Entities

welcometonightbrother (threat_actor)Cloudflare Turnstile (product)Cloudflare (vendor)