![]() I assume that you now know the techniques to prevent iFrame from security risks. Checkout to this CSP: sandbox docs for better understanding. CSP sandbox: another option similar to iFrame sandbox attribute, but this will be applied to all iFrames in a site.Checkout to this Iframe sandbox attribute docs for better understanding. It applies restrictions to a page's actions including preventing popups, preventing the execution of plugins and scripts, and enforcing a same-origin policy. IFrame sandbox attribute: Applies extra restrictions to the content in the frame.Checkout to this CSP: frame-src docs for better understanding. ![]() CSP frame-src: specifies valid sources for nested browsing contexts loading using elements such as and.Checkout to this CSP: frame-ancestors docs for better understanding. CSP frame-ancestors: specifies valid parents that may embed a page using, ,, , or.Checkout to this X-Frame-Options docs for better understanding. X-Frame-Options: HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a, , or.In this article, I will describe scenarios of using iFrame, the threats, and the solutions to minimize the chance for attackers.īefore going through the detailed scenarios, let’s refresh to these techniques that will be used to prevent iFrame from security threats: But this article will explain it more comprehensively and in simple words to make it easier for you to understand iFrame security. If you search on the internet, there are many posts and information similar to this article. However, its use has several security risks that can open the doors for attackers. If( have been around for a long time in web development, and are still widely used today. In order to use it for communicating with the parent window, you need to introduce some polling mechanism in the parent e.g.: var oldName = This is done by defining an onload callback on the iframe: iframe1.onload = function() ' Detecting when the iframe’s content has been loadedīefore you can access the contents of the iframe, you will have to wait for the iframe contents to be loaded (just like you should wait for the contents of your page to be fully loaded before accessing and manipulating them). In this case the source for the iframe contents is an HTML page on the same host/domain but you could also define a complete URL pointing to another location. Here’s a short example: var iframe1 = document.getElementById('iframe1') And styling it can be done by using the style property. Setting the URL which contents need to be loaded in the iframe, just means setting the src property of the iframe object. If you work with contents from other hosts/domains, you’ll need to have a look at the next sections as well. Please keep in mind that things are relatively easy when working with iframes which contents are loaded from the same host/domain. This section will show you how this can be done. the width and height of the iframe) and maybe access some of the DOM elements in the iframe. Now you have added this tag in your HTML code, you will most probably want to access it with JavaScript to set a URL to be loaded, define how the iframe contents should be displayed (e.g. The first step in building using iframes is of course to define an iframe tag in your HTML code which will define where in the DOM, the external resources will be taken over: Please refer to the MDN which contains a good description of iframes and a few examples. because the content is only visible after the user has been authenticated and authorized) or you need to embed content from other web sites/apps, iframes provide a nice mechanism to include content in your app and ensure that this doesn’t cause any major security issues. But whenever you have an application which doesn’t require indexing of contents (e.g. Using iframes (inline frames) is often considered bad practice since it can hurt you from a SEO point view (contents of the iframes will not be indexed by search engines).
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