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A researcher has discovered that Cloudflare's firewall and DDoS prevention can be bypassed by leveraging logic flaws in cross-tenant security controls. This vulnerability arises from Cloudflare's strategy of using shared infrastructure that accepts connections from all tenants. The researcher identified the vulnerabilities in Cloudflare's authenticated origin polls and allow list Cloudflare IP addresses. Despite reporting the issue to Cloudflare, it was marked as 'informative' and not addressed.