Security expert Neil Madden analyzes CloudFlare's OAuth provider library that was largely coded using Anthropic's Claude AI. While initially impressed by the code structure, he identifies several security issues including overly permissive CORS headers, missing security headers, incorrect Basic auth implementation, and biased token generation. The analysis reveals that despite claims of thorough review, the AI-generated code contains classic OAuth implementation bugs that experienced developers missed. Madden concludes that while LLMs can produce decent code under tight control, critical authentication systems require more careful attention and expertise than this implementation received.
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