Webview and client side hardening

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WebView and Client-Side Hardening Deep Dive

Overview

WebView and deep links are common entry points for phishing and code injection chains.

WebView Defaults

• Keep JavaScript disabled unless feature-required.
• Avoid addJavascriptInterface unless fully trusted content is loaded.
• Enforce URL allowlists and Safe Browsing.

Client-Side Hardening

• Disable screenshots for highly sensitive flows if business allows.
• Strip PII from logs and crash breadcrumbs.
• Minimize exposed debug surfaces in release builds.

Validation Strategy

• Fuzz deep links and malformed URLs.
• Test redirect and file-access bypass attempts.

Senior-Level Insights

• Security posture improves when teams treat WebView as untrusted-by-default.