DigitalExplorers Provides
- HTTPS and TLS review points
- CORS misconfiguration checks
- Sensitive data exposure review for URLs and headers
- Request, response, and transport-layer leak checks
Use When
- Checking end-to-end data security across application and network layers
- Reviewing how frontend and backend exchange sensitive data
- Auditing transport and browser security behavior
- Investigating where data may leak in transit or logs
Instructions
1. Trace Data Flow End to End
- Map how data moves from the browser to APIs, services, storage, logs, and third parties
- Identify where sensitive values appear, including tokens, identifiers, personal data, and internal metadata
- Review both successful and failed request paths
2. Check HTTPS and TLS Usage
- Ensure all sensitive traffic uses HTTPS in real deployments
- Flag mixed-content behavior, insecure redirects, or fallback to plain HTTP
- Review whether security-sensitive endpoints, assets, and API calls are consistently protected in transit
Review targets:
- Login and signup flows
- Payment or account endpoints
- File upload and download flows
- Internal admin tools
3. Review CORS Configuration
- Check allowed origins, methods, headers, and credential settings
- Flag wildcard or overly broad origin rules on sensitive APIs
- Ensure credentialed requests are restricted to trusted origins
- Review whether preflight handling exposes unnecessary access
Common risks:
Access-Control-Allow-Origin: *on sensitive endpoints- Overbroad allowed headers or methods
- Cookies or auth headers exposed to unintended origins
4. Check Sensitive Data in URLs and Headers
- Review whether secrets, tokens, emails, or internal identifiers appear in query strings, fragments, or logs
- Avoid putting sensitive values in URLs because they can leak through browser history, referrers, proxies, and logs
- Check headers for unintended exposure of internal tokens or debugging values
Review targets:
- Password reset links
- OAuth callbacks
- Search and filter URLs
- Custom auth headers
5. Review Request and Response Exposure
- Inspect request payloads and responses for unnecessary sensitive fields
- Return only the data needed by the caller
- Ensure errors and debug responses do not expose stack traces, internal hosts, or secret values
- Check whether caching layers or proxies might store sensitive responses
6. Consider Interception Risks
- Review whether tokens or session identifiers can be stolen through insecure storage, weak transport, or exposed logs
- Check whether APIs rely on transport assumptions that fail behind proxies or misconfigured environments
- Confirm sensitive requests are not downgraded, replayed, or exposed through insecure client behavior
7. Review Logging and Monitoring Leaks
- Check frontend, backend, proxy, and observability logs for sensitive request or response data
- Avoid logging secrets, tokens, cookies, full payloads, or personal data unless absolutely required and protected
- Review analytics and monitoring tools for accidental data capture
Review targets:
- Browser console logs
- Server application logs
- Reverse proxy or CDN logs
- Error tracking payloads
8. Review Third-Party Handoffs
- Identify external APIs, SDKs, analytics tools, and embedded services that receive application data
- Confirm only necessary fields are shared with each third party
- Check whether outbound requests leak internal identifiers or sensitive metadata
9. Report Findings by Severity
- Mark issues as critical, high, medium, or low based on exploitability and data impact
- Include where the data leaks or travels insecurely, why it matters, and the safer alternative
- Prioritize insecure transport, overbroad CORS, and sensitive data leakage first
Standard review flow:
- Trace data movement across layers
- Verify secure transport and redirects
- Review CORS and origin trust boundaries
- Inspect URLs, headers, requests, responses, and logs
- Summarize leaks, risks, and fixes
10. Safety Notes
- Secure transport alone is not enough if sensitive data is overexposed in logs or browser-visible locations
- Client-side protections do not replace backend authorization and server-side validation
- Logging, proxy, and analytics systems are part of the security surface
- End-to-end reviews should include normal, failure, and edge-case flows
Standard Flow
trace data flow
-> verify HTTPS and TLS behavior
-> inspect CORS and origin access
-> review URLs, headers, requests, responses, and logs
-> identify leaks and insecure transmission paths
-> report risks and fixes