Pixel art style yellow question mark block surrounded by blue and white sparkling stars on a black background.

What is web application penetration testing?

Web application penetration testing involves assessing the defenses of a web app by simulating attacks that a hacker might carry out. A penetration tester will safely test how a web application behaves under different circumstances and identify any security flaws.

We believe that both automated scanning and manual web application penetration testing are essential to maintaining a strong security posture. So, whether you’re looking to gain automated insight into your application’s security or get human experts to dig deeper and uncover more sophisticated vulnerabilities, we have a service for you.

Trusted by thousands of companies worldwide

Automated web application security testing

Secure your web applications (single and multi-page apps) and underlying infrastructure from anonymous and authenticated perspectives. Intruder’s dynamic application security testing (DAST) scanner checks for OWASP Top 10 vulnerabilities, misconfigurations and more.

automated scanning
Vanguard Advisories interface showing a new critical issue labeled 'Bug hunting' with a clickable 'Retest' button, and a false positive removed tagged as 'Medium risk'.

Continuous web application penetration testing service

Intruder's continuous penetration testing service assesses your web apps for critical vulnerabilities that aren’t detectable by automated scanners. Our penetration testers prioritize high-impact issues, from simple misconfigurations that could expose your data to complex attack chains that could give hackers control of your systems.

Close the door on hackers

Your network is always changing. It's difficult to stay on top of what's exposed to the internet, and, more importantly, what shouldn't be.

Intruder monitors your perimeter 24/7, giving you continuous visibility while also scanning newly found services for vulnerabilities automatically. Take control of your attack surface today.

Pixel art of two British guards in red uniforms and black hats standing on either side of a blue telephone booth.

Web application penetration testing: beginner's guide

Whether you’re trying to comply with regulations like ISO 27001, build trust with customers and suppliers, or just want to be sure your IT infrastructure is secure, web app penetration testing is a proven method to strengthen your cyber security posture and prevent data breaches.

+1UP image

Read our reviews on G2.com

Can I scan single page applications (SPAs) with Intruder?

Yes, you can! Learn all about how to scan SPAs with Intruder here.

What is Intruder’s Rapid Response?

Intruder’s Rapid Response is manually carried out by our security team to check for the latest critical weaknesses hitting the news, including some that our scanners don't have checks for yet or ones that are better detected by a person.

When a threat is identified, we'll scan your systems and notify you if we suspect that any could be affected. We will also send you an advisory with further details and recommendations.