Understanding how insecure CORS configurations can expose sensitive data across subdomains.
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Disclaimer:
The techniques described in this document are intended solely for ethical use and educational purposes. Unauthorized use of these methods outside approved environments is strictly prohibited, as it is illegal, unethical, and may lead to severe consequences.It is crucial to act responsibly, comply with all applicable laws, and adhere to established ethical guidelines. Any activity that exploits security vulnerabilities or compromises the safety, privacy, or integrity of others is strictly forbidden.
Table of Contents
Summary of the Vulnerability
In this scenario, the target web application implements a misconfigured Cross-Origin Resource Sharing (CORS) policy that trusts all subdomains, regardless of the communication protocol. Specifically, both HTTPS and HTTP origins are granted permission to access sensitive API endpoints. This flaw allows an attacker to host malicious code on an insecure (HTTP) subdomain and leverage CORS to…