CORS only decides which web pages may read a response in the browser. Reflected origins, wildcards with cookies, null and sloppy patterns undo that decision.
Cross-origin resource sharing is a permission slip that a server hands to browsers, saying which other web pages may read its responses. It does not keep anyone out of your server, it does not authenticate a caller, and it does nothing at all against a script or a command-line tool. What it guards is narrow and real: a page on one site should not be able to use a visitor's logged-in browser to read that visitor's private data from another site. Almost every serious misconfiguration is a way of handing out that slip to the wrong page. This guide explains what is being protected, then walks through the settings that give the protection away, and ends with a short check you can run against…
Read the full report on AISkills402: https://aiskills402.com/blog/cors-config-mistakes?utm_source=devto&utm_medium=social
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