blog.cloudflare.com· Oct 27, 2026· by Celso Martinho

Introducing the Cloudflare PHP Capture the Flag challenge

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We are launching a PHP Capture the Flag challenge integrated with our Bug Bounty program to test our WAF protections. Security researchers are invited to bypass our defenses and capture the flag to help make the Internet safer.
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.
#Bug Bounty#php#Security#Vulnerabilities#WAF