Wide-Open CORS Check — Can Any Site Read Your Responses with Your Cookies?
DevMeth checks the 48 known AI-code failure patterns — not a penetration test or a security guarantee.
What the issue is
A response that allows any origin (Access-Control-Allow-Origin: *) together with cookies lets any website's scripts send credentialed requests to your app and read the responses.
Why AI tools generate it
AI tools set permissive CORS headers so a demo works from anywhere, and the wildcard-plus-credentials combination is a classic generated mistake.
How DevMeth detects it
A read-only live probe issues a preflight to your endpoints and checks whether the response combines a wildcard allow-origin with credentials.
Your site tells any website's scripts it can send requests with your cookies
WHAT WE FOUND
response header — Access-Control-Allow-Origin: *
The fix, in three steps
Restrict Access-Control-Allow-Origin to specific trusted origins and never combine a wildcard with credentials. Three steps.
Run a free scan and each finding carries a paste-ready fix prompt you can act on.
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Why is * with credentials dangerous?
It lets any website's script send requests carrying your user's cookies and read the responses — cross-site data exfiltration.
How is this probed?
A read-only preflight request checks your endpoint's CORS response for a wildcard allow-origin combined with credentials.
What's the fix?
Restrict allow-origin to explicit trusted origins and keep credentials working with those specific origins, never a wildcard.
DevMeth checks the 48 known AI-code failure patterns — not a penetration test or a security guarantee. A clear result means each known pattern was checked and found clear or not applicable for your app; it is not a guarantee of security.