ZeriFlow Journal

Security guides your team can ship this week

Actionable articles on TLS, headers, CSP, privacy, and practical hardening for modern web apps.

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Web Security

How to Configure CORS Correctly in Node.js (Stop Using *)

Mar 27, 2026·10 min

Using a wildcard CORS policy is one of the most common security mistakes in Node.js APIs. This guide explains what CORS actually does, why * is dangerous when paired with credentials, and how to configure a secure origin allowlist.

#cors#nodejs#express

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