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What are XSS and its types?

Cross-Site Scripting (XSS) is one of the most common attacks on Web applications. It allows attackers to inject client-side scripts into otherwise trusted pages and steal confidential information from users.

The executed script is included in the web application’s response as valid. However, as soon as this happens, the attacker has complete control over all session resources, including cookies, local storage, form values, and so on.

The different XSS attack types:

• Reflected attack
• Stored attack
• DOM-based attack

Learn more in our new article about XSS types and their prevention.

What is an XSS vulnerability scanner?

The Cross-Site Scripting scanner has been developed to make your web application safe while saving developers time and money.

​​We provide a cybersecurity approach that is simple to run:

• Due to decreased time on test preparation and the remedial advice immediately shown in the scan report, and developers save roughly 100 hours per year.
• Save 40% on your petesting expenditure on average and maintain continuous security posture transparency while lowering your risk.

Note: To proceed with XSS scanning, you must own it and have the necessary admin rights. Because the Cross-Site Scripting tool can create a variety of HTTP Requests that could be flagged as attacks (even if they’re absolutely harmless), you’ll need permission to run this scanner.

How the XSS vulnerability scanner works

The XSS scanner mimics a hacker’s attack and tries to inject a JavaScript code into your website. It effectively scans for Reflected, Stored, and DOM XSS vulnerabilities.

Once the scan is concluded, all findings you can find all exposed vulnerabilities listed and classified according to priority with additional advice on how to fix them.

Why should I start an XSS vulnerability test?

Nowadays, XSS detection should be a must, as it is one of the most popular attacks on the internet. According to OWASP Top 10 2021, it can cause severe damage and consequences to your business, one of the riskiest known attacks.

Cross-Site Scripting vulnerabilities can permit harmful to the company attacks if they are not recognized and repaired in a timely manner. Hackers may easily compromise how websites display to visitors.

Not testing for XSS vulnerabilities could carry weaknesses in our web app that permit hackers to take over accounts easily, abuse user credentials, commit identity theft, impersonate users, and escalate privileges. Uploading malware, phishing assaults, exposing sensitive data, and orchestrating full-fledged attacks are other destructive behaviors they can engage in.

How to test Cross-Site Scripting

In less than 2 minutes, you can set up and begin scanning. Remember that XSS testing is invasive: our automated testing tool effectively simulates a real hacking attempt and probes your web app for XSS vulnerability. To avoid overloading your Production system, we recommend running this scanner in a Staging environment.

The time it takes to identify an XSS vulnerability varies depending on the size of the application, so don’t be concerned if it takes more than a few minutes. We’ll let you know when the scan has finished either email or your favourite chat tool; if you have integrated it already.

You may select which scanners you want to run in the Preferences area. You may run more than 15 scanners to explore or combine XSS scanning with the SQLi and CSRF scanners.

XSS attack prevention tips

The following are some solutions for preventing Cross-Site Scripting flaws:

Awareness within the organization

The whole team should be aware of the dangers and consequences of XSS attacks, as well as how to avoid the traps that lead to successful hacking.

Validation of user input

It’s vital to ensure that user-supplied data is accurate and complete. Make use of a secure transport protocol like HTTPS. Create filters to guarantee that the numeric inputs are all integers. To ensure that your application only accepts legitimate characters, use whitelisting.

Escaping/Encoding

All user data should be encoded before being committed onto a page. This entails turning HTML values that aren’t whitelisted into entities. Unicode is used to escape alphanumeric values in Javascript, for example.

HTML input should be clean

When feasible, prevent people from posting HTML markup. When user input contains HTML markup, employ filtering and encoding methods. You may also utilize libraries that take markdown content and transform it to HTML on the fly.

Security Policies for Content (CSPs)

A CSP is activated by providing the Content-Security-Policy HTTP response header and submitting a value specifying the policy. Use this policy to manage inline script execution, object sources, and the loading of external scripts, among other things.

More details about Cross-Site Scripting prevention are in this article.