To put it another way: JSONP is basically a self-inflicted XSS. The same response with a callback function specified as processData is as follows. Due to browser security restrictions, most “Ajax” requests are subject to the same origin policy; the request can not successfully retrieve data from a different domain, subdomain, or protocol. Information Security Stack Exchange is a question and answer site for information security professionals. For the purpose of user authentication, it’s favourable that you follow the general workflow of OAuth- redirect to parent website, authenticate the user and on successful authentication, generate and share a token. In this case, an attacker could input any URL and execute a Server Side Request Forgery (SSRF) attack where the attacker forces the server to make a request to the target URL.
Some other resources that favor JSON are a Cloud Elements blog and a w3schools page. If an attacker can inject any JavaScript into the original web page, then that code can retrieve additional JavaScript from any domain, bypassing the same-origin policy. However, the security aspects of using one or the other is often ignored, but they are incredibly important because, unlike functional inefficiencies, insecure implementations can lead to the exploitation of a system. The problem is external entity expansion is often enabled by default, but is rarely necessary for legitimate functionality. Their server then sends the same response and since you are logged into the ecommerce site, data containing your information is returned. The server may have privileges to access certain resources that the attacker doesn’t, and the attacker can leverage this to scan and attack services behind the server’s firewall. Assuming everybody knows what JSON is, let’s talk a little about JSONP. This attack is also called an “XML Bomb”. You have to remember to defend against CSRF vulnerabilities, and with JSONP, that gets a bit tricky. echo $_GET[“callback”] . Whenever you face a Content Security Policy on an application, review all white-listed domains, and search for JSONP endpoints. Will discuss CORS more in my next article. There are number of advantages to XML’s complexity: 1. With this approach, there will be a heavy load on the web server and leads to some other performance problems and not able to utilize the powerful browser capabilities. This is not only because JSON generally uses fewer characters, but because its syntax better matches object-oriented languages’ data structures, especially JavaScript. Here our target is to build the