If malicious content is injected into an application that escapes special characters and that malicious content uses as HTML tags, those characters are nonetheless not interpreted as HTML tags by the browser if they’ve been correctly escaped in the application code and in this way the attempted attack is diverted. For example, in HTML, can be coded as > in order to be interpreted and displayed as themselves in text, while within the code itself, they are used for HTML tags. ֿInjecting malicious code is the most prevalent manner by which XSS is exploited for this reason, escaping characters in order to prevent this manipulation is the top method for securing code against this vulnerability.Įscaping means that the application is coded to mark key characters, and particularly key characters included in user input, to prevent those characters from being interpreted in a dangerous context. The browser unknowingly executes malicious script on the client side (through client-side languages usually JavaScript or HTML) in order to perform actions that are otherwise typically blocked by the browser’s Same Origin Policy. This is done by escaping the context of the web application the web application then delivers that data to its users along with other trusted dynamic content, without validating it. Details:Ī cross-site scripting attack occurs when the attacker tricks a legitimate web-based application or site to accept a request as originating from a trusted source. append(), and others) may execute untrusted code. Passing HTML from untrusted sources - even after sanitizing it - to one of jQuery's DOM manipulation methods (i.e.html(). Jquery is a package that makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.Īffected versions of this package are vulnerable to Cross-site Scripting (XSS).
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