Cybersecurity · free, no signup
CORS Configuration Inspector
Paste the CORS response headers, and the Origin that produced them, to see what a browser would let a cross-origin page read or send. Reports the combinations browsers reject outright, credentialed access granted too broadly, cache poisoning through a missing Vary, and origin reflection — which looks identical to a correct allow-list in any single response, so the tool tells you how to tell them apart instead of guessing.
Authorized, defensive use only. Check assets you own or lawfully public data. This tool is educational and never provides another party's private data.
Paste the response headers from a cross-origin request. Nothing is fetched — supply the headers your own client received, for example from curl -I -H "Origin: https://example.com".
Supplying the Origin you sent matters: origin reflection and a correct allow-list look identical in a single response, and without it that check cannot run.
What happens to what you enter
- The analysis runs on Solvex servers. What is recorded afterwards is a SHA-256 hash of your input and a coarse summary of the outcome — never the input itself, and never a result you could be identified from.
- Tools that read public sources (certificate logs, DNS, a public chain) contact those sources from our servers through a fetcher that refuses private and internal addresses.
- An email address is stored only where a tool offers to send you a report and you choose to give one.
Limits: ten runs of this tool per minute from one address, and three signed reports per minute. Past that the tool says so and tells you when to try again.
When a free check is not enough
This tool reads what is public and reports what it can see. The API Penetration Testing engagement is the authorized, specialist-led version: signed scope, findings proven by hand, a signed report, and a retest.
Explore API Penetration Testing