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Your AI-Generated Next.js Auth Is Broken: Fix CVE-2025-29927 Now
EndOfCoding
2026-03-31•5 min read
CVE-2025-29927 is a critical auth bypass in Next.js middleware that's under active exploitation. CVSS 9.1. The vulnerable pattern — checking auth in middleware only — is exactly what Claude Code, Cursor, and Copilot generate by default. If you've vibe-coded a Next.js app with protected routes in the last 12 months, you're almost certainly vulnerable. Here's the two-part fix.
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