![]() ![]() With these two concepts explained we can now explain the name and subsequently explain the vulnerability itself. Whereas client-side scripting is normally running on a sand-boxed environment (to isolate the execution of the pages loaded on the browser, and avoid interaction with the underlying operating system) and under origin rules (to avoid sending/receiving data from other domains rather than the source), server-side JavaScript is not bound to such restrictions. Server - Server side components are responsible for dynamically constructing the page upon request, based on the data / parameters sent by the user. A wide set of frameworks such as Jquery are built on top of JavaScript to enhance user experience when browsing web pages. However, it is normally associated to Therefore, it would allow to programmatically modify the code/properties of the HTML page and in turn make the page interact with the user. JavaScript - JavaScript is a programming language on its own right. If (().indexOf(pageName.Let’s first start by explaining some core concepts necessary to understand the security implications of Server Side JavaScript Injection: SP.UI.tStatusPriColor(strStatusID, "yellow") Var strStatusID = SP.UI.Status.addStatus("Information : ", message, true) hide the subsites link on the viewlsts.aspx page String scenarioUrl = String.Format(", 'sp.js') public void AddJsLink(ClientContext ctx, Web web) The code in this article is provided as-is, without warranty of any kind, either express or implied, including any implied warranties of fitness for a particular purpose, merchantability, or non-infringement. Any existing reference to a JavaScript file called scenario1.js is removed.Ĭreates a new custom action, and assigns the script block definition created in step 1 to the new custom action.Īdds the new custom action to the website.Īll pages on your SharePoint site will now run scenario1.js and display the UI customizations shown in Figure 2 and Figure 3. Uses UserCustomActions to get all user custom actions defined on the SharePoint site. This script block definition points to a JavaScript file (scenario1.js) which is included on all pages on the SharePoint site. ![]() btnSubmit_Click calls AddJsLink, which does the following:Ĭreates a string representing a script block definition. In Figure 1, choosing Embed customization calls btnSubmit_Click in default.aspx. Screen shot of new subsite link removed from the Site Contents page Screen shot of status bar added to all pagesįigure 3. Removing the new subsite link from Site Contents as shown in Figure 3.įigure 2. Screen shot of Core.EmbedJavaScript add-in start pageĬhoosing Embed customization customizes the SharePoint site by:Ĭreating a status bar message on all pages in the SharePoint site, as shown in Figure 2. When you run this code sample, a provider-hosted add-in appears, as shown in Figure 1.įigure 1. To get started, download the Core.EmbedJavaScript sample add-in from the Office 365 Developer patterns and practices project on GitHub. Use this solution if you want to apply UI updates to your SharePoint site by using JavaScript (sometimes referred to as the Embed JavaScript technique) instead of creating custom master pages. The Core.EmbedJavaScript sample add-in adds a status bar message to all pages on a SharePoint site, and removes the new subsite link from the Site Contents page by using JavaScript. Notice also that you should not take a dependency on the html page structure or on the out-of-the-box CSS style names as these might be adjusted without a notice. You cannot use this option with modern experiences in SharePoint Online, like with communication sites. This extensibility option is only available for classic SharePoint experiences. ![]()
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