![javascript types javascript types](https://www.vangompel.net/images/og-thumbnail/img0012-2.jpg)
![javascript types javascript types](https://miro.medium.com/max/1400/1*3wp2A9xFW7LbCKFA_X2-sw.png)
Injecting malicious code and storing it on the web server.Persistent XSS attacks are Type 2 XSS attacks because the attack is carried out via two requests: The users don’t need to click on malicious links or anything else - the malicious code is already embedded in the app itself. The reason is that once the malicious data is being stored on the web app’s servers, it can potentially be served to many users. On the other hand, they are highly impactful. These types of attacks are less frequent because the vulnerabilities that make them possible are less common and difficult to find.
![javascript types javascript types](https://swall.teahub.io/photos/small/162-1621298_javascript-types.jpg)
When the web app loads the stored data afterward and embeds it into the HTML response pages is the moment when a potential code injection is possible. When the application doesn’t perform proper front-end and back-end validations before storing the data, it exposes serious vulnerabilities. Persistent XSS is possible when a web app takes user input and stores it into its servers. There are five main types of XSS attacks. Their goal is mainly to steal personal information.ĭepending on the goals of the attacker, XSS can be implemented in a number of different ways. This means that XSS attacks are not intended to damage the computer of the victim. JavaScript runs in a restricted environment that has limited access to the user’s operating system. In general, XSS attacks are based on the victim’s trust in the legitimacy of the web app they use. In the case of the browser, the attacker is injecting malicious scripts inside of a web app, which is being used by the victim. This code is then executed by the particular environment and performs malicious actions. An injection attack is performed when the attacker is able to inject malicious code into an application. OverviewĬross-Site Scripting (XSS) is a browser-side code injection attack. In the process of identifying and describing the core elements, we also share some rules of thumb we use when building SessionStack, a JavaScript application that needs to be robust and highly-performant to help companies optimize the digital experience of their users. This is post # 21 of the series, dedicated to exploring JavaScript and its building components.