Find Next.js-specific security issues across App Router, Pages Router, and Server Actions. Covers the middleware-bypass class, NEXT_PUBLIC environment leakage, RSC over-fetch, CSP for App Router, open redirects, and next/image SSRF via permissive remotePatterns. Invoke when reviewing a Next.js app before launch, after a major version upgrade, or when adding authenticated routes.
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Next.js Security
Next.js moves fast and its security model has shifted with every major version. The most common failure mode is reaching for a familiar pattern from a year ago that no longer holds — middleware-only auth, naive Server Actions, NEXT_PUBLIC_ env handling. This skill is the spot-check list.
Tested patterns target App Router on Next.js 14+; most apply to 15/16 too. Pages Router callouts are marked.
When to invoke
New Next.js app heading to production
Major version upgra
[Description truncada. Veja o README completo no GitHub.]
