Penetration testing vs. security validation: what fits when

What a penetration test delivers

In a penetration test, experienced testers try to break into systems within an agreed scope and time frame. Strengths: creativity, an understanding of business logic, in-depth analysis of individual applications. Limits: It shows the state at a specific point in time and is usually carried out only once or twice a year.

What continuous security validation delivers

Security validation – often referred to as breach and attack simulation (BAS) or automated penetration testing – replays known attack techniques in a controlled way. It shows on an ongoing basis which steps are blocked, detected or go unnoticed, and re-tests after every fix whether the gap is really closed.

When you need which

• Penetration test: before launching new applications, for in-depth reviews of critical systems, and when regulation explicitly requires one.
• Validation: for ongoing proof that security controls work, after changes and to confirm fixes.
• Both together: pentest findings feed into validation and are monitored permanently.

Regulation: NIS2 and DORA

NIS2 requires policies and procedures to assess the effectiveness of risk management measures. DORA requires financial entities to run a digital operational resilience testing program; selected, significant firms must additionally carry out threat-led penetration testing (TLPT) at least every three years. Continuous validation does not replace these mandatory tests, but it provides ongoing evidence in between.