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Convert special characters such as ?, &, /, and spaces to their respective HTML or URL encoded equivalents.

Sanitize data input in an HTTP request before reflecting it back, ensuring all data is validated, filtered or escaped before echoing anything back to the user, such as the values of query parameters during searches.

This section describes the top best practices designed to specifically protect your code:

The following environments are susceptible to an XSS attack: An example is rebalancing unclosed quotation marks or even adding quotation marks to unquoted parameters.

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The attacker injects code that appears safe, but is then rewritten and modified by the browser, while parsing the markup. The data in the page itself delivers the cross-site scripting data. The attacker forces the userРІР‚в„ўs browser to render a malicious page. When clicked, malicious code is sent to the vulnerable web site, which reflects the attack back to the userРІР‚в„ўs browser. The attacker delivers a malicious link externally from the vulnerable web site application to a user. The code is activated every time a user clicks the link. The malicious code is inserted in the application (usually as a link) by the attacker. There are a few methods by which XSS can be manipulated: Type The most prominent use of XSS is to steal cookies (source: OWASP HttpOnly) and hijack user sessions, but XSS exploits have been used to expose sensitive information, enable access to privileged services and functionality and deliver malware.

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 theyРІР‚в„ўve 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.Р”В®scaping 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 browserРІР‚в„ўs 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. DetailsР”Р„ 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. It allows attackers to execute arbitrary code in Safari and Internet Explorer. Prismjs is a lightweight, robust, elegant syntax highlighting library.Р”Р„ffected versions of this package are vulnerable to Cross-site Scripting (XSS) via the easing preview of the Previewers plugin.

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