🛡️ Sentinel: [HIGH] Fix XSS vulnerability in WebView data transfer

[TargetMisser]

🚨 Severity: HIGH

💡 Vulnerability: React Native applications passing user-provided data into a WebView component via the injectJavaScript function are exposed to Cross-Site Scripting (XSS). If user data (such as arbitrary images converted to base64 JSON representation) is executed inline via string interpolation inside the webview JS context, this creates a vector where attackers might manipulate the input format to execute arbitrary malicious JS within the WebView.

🎯 Impact: An attacker who can forge or manipulate the image data (or base64 string metadata) fed to the WebView could execute arbitrary JS code, steal cookies/storage, or further abuse the bridge context.

🔧 Fix:

• Replaced the insecure injectJavaScript(jsCode) data-passing mechanism in both HomeScreen.tsx and ShiftScreen.tsx with webViewRef.current?.postMessage().
• Registered explicit JS event listeners (document.addEventListener("message", ...) and window.addEventListener("message", ...)) within the HTML templates of the WebViews to securely capture and evaluate the JSON strings sent as event.data.

✅ Verification: Run npm run typecheck and npx jest --passWithNoTests to confirm that standard build scripts haven't regressed. Evaluated via Code Review.

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PR created automatically by Jules for task 4161462877144964331 started by @TargetMisser

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Project	Deployment	Actions	Updated (UTC)
flight-work-app	Ready	Preview, Comment, Open in v0	Apr 30, 2026 1:38am