Why Your Deep Links Might Be a Backdoor
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Android deep links are public entry points that can be exploited through intent spoofing, parameter tampering, auth bypass, link hijacking, and WebView injection. A production-grade secure architecture requires: using verified HTTPS App Links with Digital Asset Links, a single exported DeepLinkActivity as a gatekeeper that only parses and routes, strict parameter validation and allowlisting, server-side authorization on destination screens, HMAC-signed short-lived tokens with nonce/replay protection for sensitive flows, and an intent-object pattern to prevent one-click destructive actions. The guide includes Kotlin and Node.js code examples, a security QA checklist, and operational hardening recommendations like logging and rate limiting.
