Probe a target’s CORS behavior with a spoofed Origin to find credential-exposing misconfigurations.
CORS Misconfig Tester sends requests with crafted Origin headers and inspects how the server responds in Access-Control-Allow-Origin (ACAO) and Access-Control-Allow-Credentials (ACAC). Permissive combinations can let any site read authenticated responses.
It checks the dangerous patterns testers care about — reflected origins, null origin, and wildcard-with-credentials — and explains the impact of each.
Not always — impact depends on whether credentials are allowed and the endpoint returns sensitive data. The tool flags the configuration; you confirm the data exposure.