Web browsers implement strict security boundaries to isolate scripts running on different origins, preventing malicious sites from stealing user data and protecting your applications from cross-origin vulnerabilities.
1. Cross-Origin Resource Sharing (CORS)
CORS is a security mechanism that uses HTTP headers to restrict which domains can request resources from your server:
Access-Control-Allow-Origin: https://techycoderworld.com
This header prevents unauthorized origins from reading sensitive data from your API endpoints.
2. Iframe Sandboxing & Content Security Policy (CSP)
When embedding third-party content, always use the sandbox attribute to restrict script execution and prevent access to page cookies:
<iframe src="https://example.com" sandbox="allow-scripts"></iframe>
Additionally, implement strict Content Security Policies (CSP) via meta headers to whitelist secure source domains, securing your application from script execution injections and data theft.