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JavaScript Attacks in WebViews


JavaScript is widely used due to its outstanding functionality. Its presence in a website can solve many problems, however it can also introduce critical security issues. It is this very compromise that has to be carefully analyzed in the decision of allowing or not allowing JavaScript to be executed in WebView.

Some of the most aggressive JavaScript attacks will be presented in this blog post for awareness; with development teams in mind and as a contribution to the safe code propagation.

To exemplify the attacks described in this blog post, an online store was created. It only presents a login form, some articles for sale, and ads. It uses a (modified) HTML template from It is then called from an Android application inside a WebView.

Two fake domains were In real scenarios, these domains would never be chosen, they are just used in this post for a clear distinction between the victim...(continued)

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