XSS Scanner

Scan your web applications for cross-site scripting vulnerabilities with our automated XSS scanner. Integrate with your DevOps process for security while you build.

Join the thousands of companies worldwide

Easy to use XSS vulnerability scanner

Cross-site scripting (XSS) attacks are one of the common ways that web applications are hacked. They occur when an attacker is able to exploit flaws in how web applications handle user input. Malicious code is injected into trusted websites, which can lead to impactful consequences, such as hijacking of user accounts. Intruder’s XSS scanner enables you to easily identify these vulnerabilities and keep your web apps secure.

How to use our online XSS scanner


Sign up for an account

Once your account is activated, you can start scanning your systems.


Add your targets

Start scanning with just a domain name or IP address. Or, set up a cloud integration to pull targets automatically.


Get the results

Review vulnerabilities prioritized by severity and see what’s exposed to the internet.

Automatically identify XSS vulnerabilities and more

Schedule recurring scans at flexible intervals to find XSS vulnerabilities in single and multi-page applications with ease, as well as 75+ other application issues. Easily carry out authenticated scans for XSS vulnerabilities that could exist behind your application's login.

Automatically identify XSS vulnerabilities and more
Secure your applications and infrastructure in one platform

Secure your applications and infrastructure in one platform

Intruder makes it easy to continuously secure your web apps, APIs, and underlying infrastructure. Proactive emerging threat scans notify you as soon as new vulnerabilities are discovered in your systems.

Reduce the time it takes to detect and respond to XSS issues

Intruder streamlines vulnerability management and helps you track how long it takes to remediate issues so you can improve your time-to-fix. Keep on top of important alerts via Slack, Teams, or email.

Reduce the time it takes to detect and respond to XSS issues

Manual testing for XSS vulnerabilities

An automated XSS scanner can help you identify many instances of XSS vulnerabilities, but manual testing can uncover more. With Intruder's Bug Hunting Service, our experienced penetration testers can check for instances that are not detectable by scanners.

Manual testing for XSS vulnerabilities

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Can I scan single page applications (SPAs) with Intruder?
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Yes, you can! Learn all about how to scan SPAs with Intruder here.

What is a XSS vulnerability?
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A Cross-Site Scripting (XSS) vulnerability is a security flaw in a web application that allows attackers to inject malicious scripts into a trusted website. This occurs when the application does not properly validate or encode user input before rendering it in the generated web page.

The risks of an XSS attack include stealing sensitive information, hijacking user accounts, changing the content or functionality of the website, and more.

XSS vulnerabilities can be classified into various types, such as stored, reflected, and DOM-based XSS. They are included the OWASP Top 10 as critical types of injection vulnerabilities.

How does Intruder’s XSS scanner work?
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The first thing you need to do is add your applications as targets by entering IP addresses or URLs. You can then kick off your first scan in just a few clicks – it’s that simple!

Once your scan is complete, you will see a list of issues. You can search for ‘XSS’ in the search bar to see if this type of vulnerability is present, and if so, which target(s) it affects.  

What checks does Intruder perform?
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Intruder performs 75+ checks for applications, including other OWASP Top 10 vulnerabilities such as SQL injection, and 140,000+ infrastructure checks, e.g. unintentionally exposed systems, information leakage, and missing patches. Click here for more information.

Which plan do I need to get started?
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You can run XSS scans with either an Infrastructure or Application License – but an Application License will provide better coverage.

Our Application License is available across all our plans (Essential, Pro, Premium, and Vanguard). Learn more about our plans.

What scanning engine does Intruder use?
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Intruder’s XSS vulnerability scanner is powered by:

  • Essential plan: OpenVAS and Zap
  • Pro, Premium, and Vanguard plans: Tenable Nessus and Zap

For more information about our scanning engines, head here.

How does Intruder’s bug hunting service work?
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Our team of experienced penetration testers will seek to identify serious weaknesses in your external targets, such as XSS vulnerabilities undetectable by scanners with demonstrable high impact. Bug hunting is a bolt-on service available to Premium and Vanguard users and is sold and booked by the day. Click here to learn more.

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