ACME flaw in Cloudflare allowed attackers to reach origin servers

Cloudflare fixed a flaw in its ACME validation logic that could let attackers bypass security checks and access protected origin servers. Cloudflare fixed a flaw in its ACME HTTP-01 validation logic that could let attackers bypass security checks and reach origin servers. The issue stemmed from how Cloudflare’s edge handled requests to the /.well-known/acme-challenge/ path. […]

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