Exploiting trust: Weaponizing permissive CORS configurations

This research article analyzes permissive CORS misconfigurations across many domains, demonstrates multiple real-world case studies and proof-of-concepts showing how flawed Origin validation (reflected origins, trusting "null", wildcard/subdomain reflection, localhost and special-character bypasses) can be exploited to steal session tokens, take over accounts, exfiltrate internal resources, and chain multi-step attacks; it also provides testing methodology, a Burp extension, and mitigation recommendations for pentesters and developers.