Discover how a simple CORS misconfiguration can leak sensitive data across origins.
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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
This lab demonstrates a security flaw in Cross-Origin Resource Sharing (CORS) configuration, specifically when a website incorrectly trusts the "null" origin. In secure setups, web servers must validate the Origin header to ensure that only legitimate and authorized domains can request resources. However, when a server’s CORS policy includes "null" as a trusted origin, it allows potentially untrusted contexts…