NIS2 Compliance and Web Application Security: What European Companies Must Do Now

The NIS2 Directive came into force across the European Union in October 2024, and many organizations are still scrambling to understand what it actually requires from them — especially when it comes to web application security. This article breaks down what NIS2 means in practice, who it applies to, and how dynamic application security testing (DAST) fits into your compliance strategy.

What Is NIS2?

NIS2 (Network and Information Security Directive 2) is the EU's updated cybersecurity framework, replacing the original NIS Directive from 2016. It significantly expands the scope of organizations that must comply and introduces much stricter requirements around risk management, incident reporting, and supply chain security.

Where NIS1 covered a relatively narrow set of "operators of essential services," NIS2 now applies to a far broader range of sectors including:

• Energy, transport, and water
• Banking and financial market infrastructure
• Health and digital infrastructure
• Public administration
• Manufacturing (especially pharmaceuticals and medical devices)
• Food production and distribution
• Digital providers (cloud, managed services, search engines, online marketplaces)

If your organization operates in any of these sectors — or supplies critical services to organizations that do — there is a strong chance NIS2 applies to you.

What Does NIS2 Require?

NIS2 establishes a set of minimum security measures that covered entities must implement. The directive is intentionally broad, requiring organizations to take "appropriate and proportionate technical, operational and organisational measures" to manage cybersecurity risk. In practice, this translates into several concrete obligations.

Risk Management

Organizations must implement formal cybersecurity risk management processes. This includes identifying assets, assessing vulnerabilities, and maintaining documentation of risks and mitigations. For companies with web-facing applications — which today means nearly every organization — this means you cannot ignore application-layer vulnerabilities.

Incident Response and Reporting

NIS2 introduces strict incident reporting timelines. Organizations must notify their national authority within 24 hours of becoming aware of a significant incident, with a full report due within 72 hours. This puts enormous pressure on detection and response capabilities.

Supply Chain Security

One of the most challenging aspects of NIS2 is its supply chain focus. Organizations must assess the security practices of their suppliers and service providers. If a third-party web application or API is part of your service delivery, you are responsible for ensuring it meets security standards.

Vulnerability Handling

NIS2 explicitly references the need for vulnerability handling and disclosure policies. Organizations are expected to have processes in place for identifying, assessing, and remediating vulnerabilities in a timely manner.

Why Web Application Security Is Central to NIS2

Web applications and APIs represent one of the largest attack surfaces in any modern organization. According to industry data, the majority of successful breaches involve the application layer — SQL injection, cross-site scripting (XSS), broken authentication, and insecure APIs are consistently among the most exploited vulnerabilities.

NIS2's risk management requirements directly mandate that organizations address these risks systematically, not reactively. A one-time penetration test every twelve months is no longer sufficient. Regulators expect continuous monitoring and regular testing as part of a mature security programme.

This is precisely where DAST tools like Invicti become operationally relevant to NIS2 compliance.

How DAST Supports NIS2 Compliance

Dynamic Application Security Testing (DAST) works by actively probing running web applications and APIs for vulnerabilities — simulating what an attacker would do. Unlike static analysis tools that review source code, DAST tests the application in its deployed state, which means it catches vulnerabilities that only appear at runtime.

For NIS2 compliance, DAST directly supports several requirements:

• Continuous vulnerability identification. Automated DAST scanning can run on a scheduled or triggered basis, ensuring that new vulnerabilities introduced during development are caught before they reach production — or detected quickly if they do.
• Evidence for risk management documentation. DAST platforms generate detailed reports that document discovered vulnerabilities, their severity, and remediation guidance. This documentation is exactly what regulators will ask to see during audits.
• CI/CD integration for supply chain assurance. Modern DAST tools integrate into development pipelines. This allows organizations to enforce security gates — blocking deployments that introduce critical vulnerabilities — which directly addresses NIS2's supply chain security requirements.
• Proof-based scanning for accurate risk assessment. Tools like Invicti use proof-based scanning, which confirms vulnerabilities with actual exploit evidence rather than theoretical flags. This eliminates false positives and ensures that your risk register reflects real, actionable issues.

NIS2 Enforcement: What to Expect

NIS2 gives national authorities significantly stronger enforcement powers than the original directive. Penalties for non-compliance can reach up to €10 million or 2% of global annual turnover for essential entities — whichever is higher.

More importantly, NIS2 introduces personal liability for senior management. Board members and C-suite executives can be held personally responsible for cybersecurity failures. This is a significant shift and one that is already changing how organizations prioritize security investment.

In the Netherlands, the national cybersecurity authority (NCSC-NL) and sector-specific regulators are expected to begin active enforcement through 2025 and 2026. Organizations that can demonstrate a systematic, documented approach to vulnerability management will be in a much stronger position.

Practical Steps to Get Started

If your organization is in scope for NIS2 and has not yet addressed web application security systematically, the following steps provide a reasonable starting point:

1. 1Asset inventory. Document all web applications, APIs, and digital services your organization operates or relies on. You cannot secure what you have not identified.
2. 2Risk assessment. For each asset, assess the potential impact of a compromise. Prioritize applications that handle personal data, financial transactions, or critical operational functions.
3. 3Implement continuous scanning. Deploy a DAST solution to establish baseline vulnerability coverage across your application portfolio. Schedule regular scans and integrate scanning into your CI/CD pipeline where possible.
4. 4Establish a vulnerability management process. Define how discovered vulnerabilities are tracked, prioritized, assigned, and remediated. Document SLAs for remediation based on severity.
5. 5Prepare incident response procedures. Ensure you have a documented process for responding to security incidents, including the 24/72 hour reporting requirements under NIS2.
6. 6Review supply chain security. Audit the security practices of key technology vendors and service providers. Request evidence of their own vulnerability management programmes.

Conclusion

NIS2 is not a checkbox exercise. It represents a genuine shift toward continuous, risk-based cybersecurity management — and web application security sits at the centre of that shift. Organizations that invest now in systematic application security testing will not only achieve compliance more easily, but will be materially better protected against the attacks that NIS2 was designed to address.

InitiumsTech is an authorized Invicti partner based in Amsterdam. We help European enterprises implement Invicti's DAST platform and build the broader vulnerability management programmes required for NIS2 compliance. If you would like to understand how this applies to your specific environment, we are happy to have that conversation.

Ready to discuss your NIS2 security requirements? Talk to an expert at InitiumsTech.